
// Make newform 4026.2.a.bc in Magma, downloaded from the LMFDB on 25 April 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_4026_a();"
// To make the coeffs of the qexp of the newform in the Hecke field type "qexpCoeffs();"
// To make the newform (type ModFrm), type "MakeNewformModFrm_4026_2_a_bc();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose lines below.
// The precision argument determines an initial guess on how many Fourier coefficients to use.
// This guess is increased enough to uniquely determine the newform.
// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_4026_2_a_bc();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
function ConvertToHeckeField(input: pass_field := false, Kf := [])
    if not pass_field then
        poly := [-68, 574, -250, -777, 100, 284, 7, -30, -1, 1];
        Kf := NumberField(Polynomial([elt : elt in poly]));
        AssignNames(~Kf, ["nu"]);
    end if;
    Rf_num := [[1, 0, 0, 0, 0, 0, 0, 0, 0], [0, 1, 0, 0, 0, 0, 0, 0, 0], [1137130, -800938, -1379713, 435761, 306876, -80028, -16215, 4436, -99], [1153636, -8100922, 711766, 4358851, -270479, -580331, 52616, 23336, -2961], [-168584, 1724498, -1100874, -1261001, 562732, 253589, -78083, -13235, 3436], [-403440, 1017098, -2600248, -976049, 1499665, 285499, -187860, -16662, 7105], [1565484, -1141722, -5282530, 1045333, 2370547, -14833, -253236, -3932, 8041], [663210, -1838422, -2603901, 525078, 1126738, 33285, -127244, -4941, 4471], [-1897832, -86534, 3905233, 735923, -1689470, -286874, 205327, 18176, -7907]];
    Rf_basisdens := [1, 1, 200458, 400916, 200458, 400916, 400916, 200458, 200458];
    Rf_basisnums := ChangeUniverse([[z : z in elt] : elt in Rf_num], Kf);
    Rfbasis := [Rf_basisnums[i]/Rf_basisdens[i] : i in [1..Degree(Kf)]];
    inp_vec := Vector(Rfbasis)*ChangeRing(Transpose(Matrix([[elt : elt in row] : row in input])),Kf);
    return Eltseq(inp_vec);
end function;


// To make the character of type GrpDrchElt, type "MakeCharacter_4026_a();"
function MakeCharacter_4026_a()
    N := 4026;
    order := 1;
    char_gens := [1343, 1465, 3235];
    v := [1, 1, 1];
    // chi(gens[i]) = zeta^v[i]
    assert UnitGenerators(DirichletGroup(N)) eq char_gens;
    F := CyclotomicField(order);
    chi := DirichletCharacterFromValuesOnUnitGenerators(DirichletGroup(N,F),[F|F.1^e:e in v]);
    return MinimalBaseRingCharacter(chi);
end function;

function MakeCharacter_4026_a_Hecke(Kf)
    return MakeCharacter_4026_a();
end function;


function ExtendMultiplicatively(weight, aps, character)
    prec := NextPrime(NthPrime(#aps)) - 1; // we will able to figure out a_0 ... a_prec
    primes := PrimesUpTo(prec);
    prime_powers := primes;
    assert #primes eq #aps;
    log_prec := Floor(Log(prec)/Log(2)); // prec < 2^(log_prec+1)
    F := Universe(aps);
    FXY<X, Y> := PolynomialRing(F, 2);
    // 1/(1 - a_p T + p^(weight - 1) * char(p) T^2) = 1 + a_p T + a_{p^2} T^2 + ...
    R<T> := PowerSeriesRing(FXY : Precision := log_prec + 1);
    recursion := Coefficients(1/(1 - X*T + Y*T^2));
    coeffs := [F!0: i in [1..(prec+1)]];
    coeffs[1] := 1; //a_1
    for i := 1 to #primes do
        p := primes[i];
        coeffs[p] := aps[i];
        b := p^(weight - 1) * F!character(p);
        r := 2;
        p_power := p * p;
        //deals with powers of p
        while p_power le prec do
            Append(~prime_powers, p_power);
            coeffs[p_power] := Evaluate(recursion[r + 1], [aps[i], b]);
            p_power *:= p;
            r +:= 1;
        end while;    
    end for;
    Sort(~prime_powers);
    for pp in prime_powers do
        for k := 1 to Floor(prec/pp) do
            if GCD(k, pp) eq 1 then
                coeffs[pp*k] := coeffs[pp]*coeffs[k];
            end if;
        end for;
    end for;
    return coeffs;
end function;


function qexpCoeffs()
    // To make the coeffs of the qexp of the newform in the Hecke field type "qexpCoeffs();"
    weight := 2;
    raw_aps := [[1, 0, 0, 0, 0, 0, 0, 0, 0], [1, 0, 0, 0, 0, 0, 0, 0, 0], [1, -1, 0, 0, 0, 0, 0, 0, 0], [1, 0, 0, 0, 0, -1, 0, 0, 0], [1, 0, 0, 0, 0, 0, 0, 0, 0], [1, 0, 1, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 1, -1, 1, 0, 0], [0, 1, -1, -1, -2, 1, -1, 0, -1], [0, 1, 0, 1, 0, 1, 0, 0, 0], [-2, 1, -1, -1, -2, 1, 0, 0, -1], [3, 0, 0, 1, 0, 1, 0, 0, 0], [2, 1, 0, -1, -1, 1, -1, 0, 1], [0, 0, -2, -1, -1, 0, 1, 0, -1], [1, -1, 2, 1, 1, 0, -1, -2, 1], [1, 1, 0, -1, 0, 1, 0, 0, 1], [0, -2, 1, 1, 2, 0, -1, -1, 0], [1, 0, 0, 1, 1, 0, 0, 1, 1], [-1, 0, 0, 0, 0, 0, 0, 0, 0], [-1, 2, -1, 0, -1, 0, 0, 0, -1], [2, 1, -2, 0, 0, 2, 0, 1, 0], [1, 2, -1, 0, 0, 1, 1, 0, -1], [0, 1, 0, 1, 1, -2, 3, 0, 0], [3, 2, 1, 0, -2, 1, -1, 0, 1], [1, 1, -2, 0, 0, 1, 1, 1, 0], [1, 0, 3, 1, 2, 0, 0, 1, 1], [-3, 1, 1, 0, -1, 1, -1, 1, 0], [0, 0, -1, 1, 0, 1, -1, -1, -1], [-3, 0, 0, 0, -1, -1, -1, 1, 0], [0, 1, -1, 0, -1, 0, 1, 1, 0], [2, -2, 1, -1, 2, 0, 1, 1, 0], [5, 1, 0, -2, 1, -1, -1, 1, -1], [-3, -1, 1, 0, 2, -1, -1, 0, 0], [-3, 3, -1, -2, -5, 3, 0, -1, 0], [-2, 3, 0, 0, -1, 1, -1, -2, 1], [3, -1, 1, 0, 4, -3, 1, -1, -1], [-3, 1, -2, -2, 0, -4, 2, 1, -1], [0, -1, 1, 1, 3, -2, 0, -3, 2], [0, -1, 1, 1, -2, 1, 2, 0, -1], [-3, 1, 1, -1, 2, -2, 1, -2, 1], [-4, -5, 1, 1, 2, -3, -2, -2, -1], [0, -2, -1, 1, -1, -1, 2, 1, 0], [1, -3, 3, 3, 2, 0, 1, -1, 0], [-3, 2, -2, -1, -1, 4, -3, 1, -1], [1, -2, 2, 3, 3, -1, 1, 0, 1], [-7, 0, 0, -2, -2, 1, -2, 0, -2], [6, 2, -1, 0, 0, -2, -1, 0, -1], [-5, 3, -1, -3, -3, 1, -2, -1, 0], [1, 3, 1, 1, 2, 0, 1, -2, 3], [1, 2, 0, -2, 1, 1, -1, 2, 3], [4, -5, 1, 1, 3, -1, 2, 0, 0], [2, -4, 2, 4, 3, 0, 1, 0, 1], [2, 0, -2, -1, -2, 1, 0, 1, 2], [2, 1, 0, -1, 2, 1, -2, 0, 2], [-3, -4, 1, 1, -2, 1, 0, -1, -2], [-9, -4, 3, 2, 1, -4, 0, -2, -1], [-5, 0, 2, 2, 1, -3, 1, 2, 1], [0, 0, 2, 1, 3, 0, -1, 0, 3], [4, 1, -2, 1, -2, -1, 2, 2, 0], [-3, 4, -2, -3, -3, 4, -1, -1, -1], [-5, 0, -4, 0, -2, -1, 2, 0, -2], [1, -3, 1, 1, 5, 0, -2, 0, 0], [-5, 3, -2, -5, -8, 6, -4, 2, 0], [-3, -2, 1, 4, 3, -2, 0, -1, 0], [-4, 1, -1, 1, 1, -3, 4, 2, 0], [4, 1, -1, 1, 1, 3, 0, 0, 2], [2, -4, -1, 0, 0, -1, 1, -1, 1], [0, 3, -2, -2, -3, -6, 1, 1, -3], [6, -2, 1, 1, -1, -3, 0, -4, -1], [-3, -1, 2, 0, 1, -6, -1, -2, -3], [-4, -2, -1, 0, 1, -4, 2, 0, -2], [7, 2, -2, -1, 0, -2, -2, 1, 2], [-9, -1, 1, -1, 2, -1, 0, -2, -4], [0, -2, -1, -2, -2, 1, -1, 4, 0], [4, -3, 2, 2, 6, -4, 6, 3, 2], [0, 0, 0, -3, -1, -1, 0, -1, 3], [3, 3, -3, 0, 0, 3, 1, 3, 3], [1, 0, -4, 2, 0, 3, 0, -2, 0], [1, 2, -1, 1, -1, 1, 0, -2, 0], [-5, 1, 2, 1, 6, -6, 3, 4, 2], [-1, -6, 4, 3, -1, 1, 1, 0, -1], [-3, 2, -2, 1, -4, -2, 2, -1, 0], [-2, -5, 1, 0, -3, 2, 0, 0, -3], [-3, -1, -1, 0, 0, 5, -5, -1, 1], [5, -7, 3, 0, 4, 1, 3, 1, -1], [0, -5, 2, 6, 7, -2, 0, -1, 1], [4, -5, 8, 2, 6, -4, 0, -3, 2], [0, -4, -1, -4, -4, -1, -3, 0, -4], [3, 6, -5, 0, 1, 4, 2, 4, 1], [-1, 7, -3, -2, -3, 8, 0, -1, 1], [2, -1, 5, -3, -2, -2, -1, 0, 0], [-14, 1, 2, 0, 2, -3, 3, -1, -3], [3, -1, 1, 1, -4, 2, -1, 2, -1], [-1, 2, -6, 0, 0, 1, 4, 2, -2], [-6, 0, 1, 1, -4, 4, -3, -1, 2], [7, -2, 5, 5, 6, 0, 1, -1, 3], [-10, 1, -3, -2, -3, 0, -2, 3, -2], [5, 0, 1, -5, -3, -1, -4, 1, 3], [3, 0, -2, -4, 3, 1, -5, 2, 1], [8, -6, 1, 2, 4, 1, -1, -3, -3], [-1, -5, 0, -1, 3, 0, -1, 2, -1], [0, -5, 7, 2, 4, 1, -5, -2, 5], [3, -8, 2, 5, 6, -2, 3, -1, 4], [-5, 7, 1, 2, -1, 3, 4, 1, 2], [-13, -2, 4, 1, 4, -5, 2, 0, -2], [2, -2, 0, 1, -2, 1, -2, 1, 2], [-4, 1, -5, -1, -5, 5, -4, 4, -2], [-9, 6, 2, 3, 2, -2, 5, 1, -2], [-13, 5, -2, 1, -2, 0, 4, -2, -2], [-5, 8, -5, 1, -2, 6, 1, 1, -1], [3, -1, -2, 2, 1, -1, 1, -1, -3], [5, -9, 4, 6, 8, -3, 1, -1, 4], [-8, -3, 4, 0, 6, -5, 3, -3, -1], [-6, -1, -2, -3, 5, -1, 0, 2, -3], [-11, 5, -3, -4, -5, 1, -3, -1, 0], [10, 1, -1, -2, -5, 6, 0, -1, -2], [6, -2, 3, 4, 3, 0, 4, -2, 4], [-9, 1, -3, -3, -7, 5, 2, 2, -5], [-9, 3, 0, 1, -3, 6, -3, 0, -1], [-2, 0, -1, 2, 8, -1, 3, 0, 2], [-8, 2, -4, -3, -4, 5, -6, 2, -1], [15, -4, 0, 2, 6, -2, 2, -3, 0], [5, -5, 1, -2, 1, 0, 0, -2, 2], [6, -2, 4, -1, 8, -11, 2, 1, 2], [-2, -6, -1, -2, -5, 6, -2, 0, -2], [1, -6, 4, 3, 2, -4, -1, 1, 0], [-5, -4, 2, 4, 2, 1, 1, -2, 0], [7, 3, 0, 1, 5, -1, -1, 3, 3], [-6, 7, 0, -1, -3, 0, -1, 0, 0], [6, -1, 1, 4, 6, -4, 3, 3, 1], [14, -1, -1, -6, 0, 0, 1, 3, -1], [-8, -1, 0, -2, -1, -1, -3, 0, 3], [1, 5, 0, -1, 2, -2, -3, -2, 2], [-7, 3, -1, -1, 3, -1, 2, -2, 1], [-1, 2, 0, 4, 5, -7, 5, 0, -3], [-12, 9, -4, -1, -5, 6, 3, 2, -2], [7, 0, 2, 0, 2, -4, 2, -1, -2], [0, 3, -2, -2, -9, 7, -3, 6, -3], [-7, -3, 1, 2, -1, -2, 2, -4, 0], [-5, 0, 0, -3, -3, -2, -5, 1, 1], [-9, -9, 5, 1, 9, -5, 0, -3, 0], [-11, -2, 3, 0, 6, -5, -3, 0, 3], [-5, -3, 11, 2, 10, -7, 5, -3, 3], [3, 3, 1, -2, -1, 0, 0, -2, 4], [-10, 1, -3, -1, -6, 4, 3, 2, -4], [10, 1, -1, -2, -7, 6, -4, -1, -4], [1, 5, -1, 3, -2, -5, 1, -1, -1], [7, 10, 0, 2, 2, -5, 1, -4, 0], [-3, -9, 13, 8, 9, -6, -2, -4, 2], [14, -3, 1, 4, -2, -4, 4, -1, -1], [-9, 3, -5, -4, -4, 2, 1, 6, 1], [-4, 12, 1, -1, -1, 3, -2, -1, 4], [0, 6, -4, 3, -3, 3, -3, -1, 1], [2, -9, 8, 7, 13, -3, 1, 2, 7], [-1, 6, 1, -1, -5, 0, -2, -3, 2], [-7, -4, 3, 1, 5, -4, 0, -5, 4], [-12, -2, -2, 0, -4, 3, 4, 1, -6], [10, 5, 0, -1, -9, 3, -2, 2, 1], [3, -3, 1, 6, 9, -7, 2, 1, 4], [9, 0, 3, 3, -2, 4, -3, -1, -1], [-2, -8, -4, 5, 3, 1, 0, -1, 1], [10, -3, 8, 3, 5, -2, -5, -2, 0], [-14, 9, -2, 0, -5, -2, 5, -1, -5], [6, -3, 0, -5, -7, 1, -6, 0, -5], [-10, -9, 6, 4, 14, -8, 0, -5, 4], [4, -4, -2, 1, 5, 1, -1, -1, -1], [1, 0, -4, -5, -7, 2, -1, -3, -1], [8, -1, 4, 5, 5, -6, -1, -4, 2], [34, 3, 0, 0, 2, -8, 4, -1, 0], [13, 7, -9, -4, -7, 6, 0, 4, 0], [1, 4, -8, -3, -5, 2, 3, -3, -9], [-6, -7, -1, 3, -1, 7, -4, 0, 0], [17, -5, 3, 0, 2, -3, -3, 1, 3], [-12, 1, -2, -2, 6, -4, -1, 5, 2], [-4, 4, -3, -9, -11, 3, -4, 1, 0], [-6, 4, -2, 3, 2, 1, 10, -1, -2], [7, -4, 1, -4, 1, 0, 2, 2, 1], [0, -9, 4, 1, 1, 6, -1, 2, 0], [1, -7, 0, -3, 0, 3, 2, 2, 1], [21, 4, 4, -1, -5, 2, -3, -1, -1], [-4, 1, -8, -1, -2, -7, 8, 4, -4], [-1, 3, -11, -7, -11, 5, -6, 1, -4], [-10, 1, -3, -5, -3, 1, 2, 0, 2], [3, 0, -2, 4, -1, 1, 5, -2, 1], [-17, -4, 4, 3, 9, -6, -1, -1, 3], [9, -10, 0, 3, 3, 1, -1, 0, -1], [17, 12, 0, -6, -9, 1, 3, 0, -1], [7, -2, -4, -5, -4, 0, -4, 5, -2], [12, 7, -1, 0, -2, 6, 2, -3, 1], [9, 14, 0, -3, -8, 2, -2, -3, 0], [-8, -3, 2, -4, -8, 5, -9, -1, -3], [-1, -2, 0, -3, -5, -2, -1, 3, 1], [-8, -11, 7, 0, 9, -9, 4, 2, 6], [-2, -10, 8, 5, 9, -1, 0, 1, 7], [4, 4, -5, -5, -6, -4, 5, -2, -1], [-13, -3, 7, 3, 0, 4, -7, 0, 7], [-23, -1, 3, 0, 5, -5, -4, -1, 2], [1, -3, -4, -1, 3, 2, 7, 0, -1], [8, -3, 0, 4, 6, 3, -2, 2, 0], [1, 11, -5, -9, -10, 10, -7, 2, -3], [-8, -1, -1, 6, 5, 2, -2, -1, 2], [2, -6, 2, 1, -5, 10, -7, -5, 0], [-6, 2, -2, 2, 1, -6, 5, -2, -1], [-4, 0, -6, 0, 2, -7, 2, -1, 0], [-9, 4, 0, -3, 6, 1, 0, -4, 0], [-16, -2, 1, 0, 3, 0, -2, 2, -2], [-2, -9, 0, 1, -3, 8, -1, 1, 1], [11, -14, 4, 1, 4, 1, -2, 4, 2], [5, 1, -5, -5, -12, 6, -5, 2, -3], [-13, 5, 7, -5, -3, 1, -2, 2, 3], [10, -7, 1, 2, 8, 3, -7, -3, 4], [-3, -9, 0, 6, -1, -5, 7, -3, -3], [-13, 5, 0, 4, 1, 5, 5, -3, -1], [-2, -3, 6, 6, 7, -6, -5, -7, -1], [4, 3, -4, 2, 0, 1, 5, 3, 1], [-24, 5, -4, -4, -7, 0, 0, -5, -3], [17, -7, 5, -1, 2, 0, -1, 2, 1], [21, -3, 5, -2, 3, -5, -1, 3, 2], [-4, -2, -8, -1, -2, -1, 2, -5, -4], [7, 6, -4, -4, -12, 6, 0, 5, -6], [33, -3, 3, 0, 2, -3, -3, 3, -1], [-1, 4, 6, -4, 3, 3, 0, 4, 5], [15, -7, 10, 3, 12, -16, 1, 0, 4], [14, 8, -1, -3, -18, 5, -2, -3, -5], [-7, 2, 1, -3, -4, 2, -1, -5, -3], [-8, -1, -1, -2, 7, 4, -2, 5, 4], [2, -5, 0, -2, 2, 2, -6, -1, 2], [24, 5, -1, -4, -14, 8, -8, -3, -1], [17, -9, 8, 4, 10, -4, 0, -1, 9], [-1, 1, -1, -2, -3, -5, 0, 5, -2], [0, -1, -4, 3, 5, -1, -1, 0, 3], [12, -9, -6, -1, -5, 4, 1, -1, -3], [7, 2, -3, 4, 3, 6, 6, 0, -1], [-8, 13, -5, -7, -9, 13, -10, 4, -4], [13, -8, 5, 3, 11, -16, 4, 1, 0], [-5, -1, -3, 0, -9, 5, 1, 1, -2], [-9, -8, 5, 8, 14, -3, 2, 2, 3], [29, -1, 0, 1, 2, -3, -2, -4, -3], [-15, 3, 3, -3, -1, -2, -1, -4, 2], [5, -1, 2, 6, 1, -4, 4, 1, 2], [2, -6, 10, 3, 1, -12, -3, -6, -3], [-19, 17, -11, -10, -18, 9, -6, 1, -3], [1, -2, -4, -4, -5, 1, 1, 0, 1], [-1, 8, -4, -2, -6, 0, -2, 1, 0], [6, -5, 0, 5, 5, 2, 1, -4, 4], [-3, 0, 3, -2, 8, -17, 5, 4, -1], [18, 11, 1, -6, -1, 6, 0, 3, 4], [10, 6, 1, -1, -7, 3, -6, -3, -2], [26, 0, 2, 0, 6, -10, 0, -2, 6], [2, -4, 6, 8, 2, 4, 0, -4, 4], [1, -3, 5, 6, 8, 5, -3, -3, 3], [7, 0, 0, -3, 1, -8, 7, 3, 3], [-7, 3, 1, -5, -9, 5, -4, 5, -6], [16, -6, 5, 6, 7, -16, 2, -4, 0], [-2, 6, 0, -5, -2, -1, 2, 7, -4], [-3, -2, 3, 1, 0, -8, 1, -1, -1], [-3, 5, -3, 0, -10, 3, 1, 1, -5], [22, 12, -1, -6, -13, 4, -4, -1, -5], [6, 2, 0, -4, -6, 10, -2, 6, -2], [3, 3, -5, 1, 8, -6, 11, 0, -3], [12, 12, -9, -8, -9, 8, 2, -1, -7], [22, -5, 0, -5, -1, 1, 2, -2, -3], [-1, 0, -7, 0, -2, 0, 3, -3, -5], [1, 15, -14, -9, -14, 5, 4, 2, -11], [22, -9, 10, 1, 2, -6, -1, -4, 1], [5, -5, -5, -2, -10, 9, -3, -1, -3], [13, 8, -2, 4, -8, 15, -1, 2, 0], [11, -4, 4, 2, -10, 4, -4, -1, 0], [-5, 10, -3, -6, -11, 10, -6, 4, -1], [22, 5, 1, 0, -1, 6, 2, 7, -2], [0, -1, 1, 8, 12, -5, 9, 1, 2], [-2, -7, 9, 7, 2, -1, -3, -4, 1], [-11, -12, 4, 4, 12, -9, 3, -4, 8], [18, -6, 1, 4, -3, 9, -3, 0, 1], [2, 7, -4, -2, -7, 7, 5, 3, 2], [-9, 1, -1, 4, -6, 0, 1, -8, -5], [14, 10, -1, -2, -13, 4, -2, -2, 2], [-23, 12, -8, -4, -13, 9, 2, 6, -1], [18, -5, 1, -2, -4, 4, -9, -5, 1], [-12, -2, 0, 3, 3, -1, -1, -7, -1], [10, 5, 2, 1, 2, -1, 0, 1, 1], [-14, -1, 4, 1, -5, -5, -8, 2, -5], [8, 1, -1, 2, 0, 3, 9, 5, -4], [9, 4, -3, -2, 1, 6, 6, 2, 3], [-6, 3, 0, -2, -2, 4, 2, 3, 0], [-4, 1, -4, 0, -5, 13, -5, 0, -1], [24, 5, 5, 3, 2, -4, 5, -3, 3], [-2, 14, -12, -5, -22, 23, -6, 5, -2], [26, 4, -5, -3, 1, 7, -4, -3, 4], [-28, 1, -2, -4, -1, -6, 5, -5, -9], [-13, 9, -3, 4, -9, 11, -2, -1, 2], [16, 3, 2, 4, 3, -17, 5, -1, -2], [-10, 9, -4, -4, -8, 8, 2, -1, 2], [6, -7, 1, -1, 12, -10, 9, -3, -1], [10, -12, 12, 5, 14, -3, -8, -5, 10], [2, 3, 5, 2, 3, 2, -3, 7, 2], [17, -22, 11, 13, 19, 0, 2, -1, 10], [13, 6, 0, 3, -4, -1, 6, -1, 1], [24, 2, -2, -1, -7, -7, -1, -3, -1], [-4, 6, 2, -3, -9, -7, -5, -3, -3], [18, -1, -2, -7, -2, -5, 6, 4, 0], [32, 0, 0, 0, -4, 2, -4, -4, 0], [-21, -6, -3, -6, 3, -6, 2, 2, -1], [2, 2, -5, -2, -5, 8, 0, 4, 0], [14, 3, 2, 3, 1, 4, -7, 0, 0], [-27, 4, 0, -6, -6, 1, -2, -2, -6], [9, -2, -1, 4, 1, -15, 4, -6, -6], [-2, -9, -3, -2, -1, -4, -2, 1, -4], [21, 0, -2, -4, -5, 5, -11, -2, -1], [4, -4, 4, 7, 16, -9, 6, 3, 4], [21, -10, 9, 2, 6, -3, -3, -6, -3], [26, -9, 1, -3, -2, -4, -5, -2, -4], [0, -12, 5, -3, 13, -15, 8, -1, -2], [-7, -4, 7, 2, 1, 3, 2, -4, 4], [4, -7, 1, -1, 8, -5, 6, -2, -1], [-12, 8, -2, -1, -14, 11, -2, 1, 2], [5, 7, -7, -1, -4, 8, 1, 4, -1], [49, 4, 2, 0, 1, 3, -5, -4, 7], [1, -10, 1, 1, -9, 8, -6, 3, -6], [21, -2, -4, 1, 7, -1, 4, -1, -2], [-24, 10, -5, -4, -5, 2, 2, 0, -10], [-10, -5, 0, -2, 5, -3, 3, 5, 6], [-8, -3, -1, 12, 3, 2, 2, -3, 2], [25, -5, 7, 3, 8, -4, -3, 0, 9], [-12, -1, -3, -7, 4, 0, -1, 7, 5], [2, -14, 8, 3, 5, -14, -5, -3, 6], [-1, 10, 2, -1, -1, 0, -5, -1, 5], [16, 2, -4, -1, -3, 10, -7, 1, 2], [-26, 2, -3, -2, 2, -4, 1, 2, 3], [-3, -2, -6, -1, -2, -1, 8, -3, -9], [14, 3, 9, 8, 9, -6, -4, -9, 4], [-1, 3, -3, 4, 8, -7, 6, 7, 3], [30, 0, -1, 4, -1, 10, 2, -2, -2], [6, -15, 3, -4, 5, -2, -2, 3, 6], [-1, -7, 0, 2, 3, 2, 13, 2, 1], [1, -3, -11, 2, -7, 6, -6, 0, -2], [16, 8, -7, -4, -11, 3, -11, 2, -5], [0, -4, -4, 6, 8, -6, 16, 0, 0], [46, -7, 3, 4, 8, -5, 9, 2, 1], [7, 3, -3, -1, -14, 16, -3, 8, -1], [-9, -7, 2, 0, -4, 8, 0, 3, -5], [2, -11, 13, 8, 13, -14, 10, 5, 4], [-3, 9, 0, 8, 6, -3, 9, -1, 2], [27, 3, -4, -11, -16, 1, -4, 2, -9], [-11, 1, -1, 7, -1, -3, 8, -5, 2], [-6, 14, -7, -5, -19, -1, -4, -5, -4], [-2, 3, -11, -2, -9, -2, 6, 5, -10], [-9, 0, -1, -4, -1, 5, 4, -2, -2], [-20, 4, -1, -1, -9, 9, -12, 3, -2], [3, 15, -9, -5, -13, 11, 0, 2, -9], [4, 2, 3, 0, 2, 9, -5, 7, 1], [-8, -11, 14, 5, 4, -7, -8, -2, 6], [-29, 2, 4, 6, -1, -7, 13, 0, -5], [-4, -11, 9, 9, 8, -3, -1, -6, 3], [24, -1, 2, 4, -4, 16, -6, -1, 0], [7, 6, -6, 2, -11, 5, -3, 2, -7], [-27, 3, -3, -2, -4, 3, -5, 1, -1], [25, 1, 3, -1, 2, -5, 7, 7, -1], [6, 0, -4, -7, -6, -3, -4, -3, -12], [8, 10, -2, -7, 1, 8, -1, 5, 0], [-3, 10, -3, 3, -4, 22, -1, 1, 3], [5, 12, -12, -4, -14, 19, 0, 8, 4], [-2, -1, -5, -2, 5, -8, 4, -1, -6], [2, -5, -1, 2, 1, 12, -12, -5, 2], [7, -1, -6, -1, -5, -4, 3, 5, -2], [-20, -8, 0, -4, 5, -12, -4, 2, 3], [0, 1, -5, 6, 17, -12, 16, -3, -2], [2, 8, 0, -4, -7, 8, -4, -6, 3], [3, 0, -3, -10, -11, 2, 4, 8, -9], [-9, -6, -7, -3, -2, -10, 1, -5, -1], [29, 4, -4, -14, -11, -7, 6, 6, -3], [-2, 1, 4, -3, 5, 2, 3, 2, 0], [11, -12, 2, 11, 13, -14, 9, -9, 5], [4, -6, 13, 8, 10, -14, 1, 0, 3], [4, 7, 6, -6, -13, 9, -17, 1, 4], [-33, 0, 2, -1, 3, -6, 3, 5, -1], [5, -6, 3, -5, 0, -1, 4, -3, 0], [-7, 3, -8, -3, -20, 22, -8, 4, -4], [11, -5, 1, -1, 3, -9, -4, 3, -4], [0, 7, -1, 3, -7, -9, -2, -4, -6], [11, -7, -1, -2, 3, 7, 0, 9, 0], [13, -14, 9, 5, 13, -3, 4, -5, 1], [16, -13, 19, 4, 18, -12, 0, -7, 9], [18, -4, 5, -4, -14, 7, -13, -4, -4], [-9, -1, -3, -4, 7, 2, -2, 4, 6], [-2, -3, 5, 1, 10, -13, 7, 0, -3], [3, 1, 6, 1, -1, 8, -5, 4, 3], [-33, 5, -6, -6, -6, 13, -10, 5, -6], [6, -18, 8, 9, 14, 5, -4, -4, 7], [-3, 0, 7, 4, 7, -4, 12, -8, 7], [10, -3, 2, -1, 6, 1, 4, -1, -3], [13, -11, 11, 1, 4, -10, 2, 4, 1], [13, 9, -10, -10, -7, 1, -5, 3, -7], [-6, 12, -5, 2, -11, 8, 0, -2, -2], [-36, -7, 0, -1, 7, -10, 1, 0, 2], [8, -16, 8, -3, -2, 5, -16, -7, 0], [18, 9, -2, 3, -4, 5, 2, -5, -7], [5, 11, -1, -4, -14, -3, 9, 3, -5], [30, 5, 1, -3, 8, -3, -3, 0, 11], [-13, -9, 7, 1, -1, -8, -1, 2, 2], [-2, -2, -8, -5, -3, -6, -1, -1, 0], [27, -13, 7, 7, 11, -18, 5, -10, 2], [-7, 8, -5, -6, -7, 3, 5, 8, 4], [-19, -6, 8, -3, 12, -12, 1, 1, 10], [1, 8, -5, 2, 6, -7, 9, 4, -1], [17, 3, -3, -4, 1, 9, -5, -5, 6], [21, 2, -3, 6, 5, -1, 7, 4, 6], [8, -2, 0, -11, -6, -1, -6, 7, 6], [-22, 3, -3, -1, -15, 17, -12, 0, 0], [-1, 1, -5, 11, 11, -6, 3, 2, 6], [13, -22, 14, 3, 3, -8, -5, -11, -5], [-17, -7, 13, 10, 12, 5, -3, -9, 13], [12, 12, -12, -8, -14, 6, -10, 4, -10], [-14, 1, 7, -5, -4, 5, -4, 4, -1], [-19, -7, 2, 3, -4, 11, -10, -2, -3], [18, -26, 12, 1, 3, -5, -5, -5, -5], [14, 6, -6, 4, 1, -8, 9, 6, 3], [-6, -11, -1, 5, 13, -1, 0, 0, 2], [3, 8, 6, 8, 2, 4, -8, 2, 3], [19, -9, 3, 1, 7, 2, -3, -8, 8], [3, 6, -10, -8, -11, -7, 1, -4, -7], [16, -3, 6, 4, 8, -8, 0, -1, -2], [-1, -13, 10, 6, 19, -19, 3, -3, 3], [33, 1, -5, -4, 4, 2, 1, 2, 1], [14, -7, 15, 9, 3, 1, -4, 0, 6], [25, 22, 1, -6, -8, 7, 0, -2, 5], [-12, -10, 14, 15, 20, -9, -6, -5, 6], [-22, 7, -5, 1, -14, 5, -6, -2, -3], [26, -4, 10, 1, 13, -16, 7, -6, 5], [-5, -6, 5, 6, 11, -17, 0, 6, 4], [-14, 10, -10, -7, -16, 1, 1, -3, -6]];
    aps := ConvertToHeckeField(raw_aps);
    chi := MakeCharacter_4026_a_Hecke(Universe(aps));
    return ExtendMultiplicatively(weight, aps, chi);
end function;


// To make the newform (type ModFrm), type "MakeNewformModFrm_4026_2_a_bc();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose lines below.
// The precision argument determines an initial guess on how many Fourier coefficients to use.
// This guess is increased enough to uniquely determine the newform.
function MakeNewformModFrm_4026_2_a_bc(:prec:=9)
    chi := MakeCharacter_4026_a();
    f_vec := qexpCoeffs();
    Kf := Universe(f_vec);
    // SetVerbose("ModularForms", true);
    // SetVerbose("ModularSymbols", true);
    S := CuspidalSubspace(ModularForms(chi, 2));
    S := BaseChange(S, Kf);
    maxprec := NextPrime(2999) - 1;
    while true do
        trunc_vec := Vector(Kf, [0] cat [f_vec[i]: i in [1..prec]]);
        B := Basis(S, prec + 1);
        S_basismat := Matrix([AbsEltseq(g): g in B]);
        if Rank(S_basismat) eq Min(NumberOfRows(S_basismat), NumberOfColumns(S_basismat)) then
            S_basismat := ChangeRing(S_basismat,Kf);
            f_lincom := Solution(S_basismat,trunc_vec);
            f := &+[f_lincom[i]*Basis(S)[i] : i in [1..#Basis(S)]];
            return f;
        end if;
        error if prec eq maxprec, "Unable to distinguish newform within newspace";
        prec := Min(Ceiling(1.25 * prec), maxprec);
    end while;
end function;


// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_4026_2_a_bc();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
function MakeNewformModSym_4026_2_a_bc( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_4026_a();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<5,R![160, -604, -342, 1581, -631, -234, 147, -2, -8, 1]>,<7,R![5632, -10080, 772, 4924, -1663, -454, 250, -6, -9, 1]>,<13,R![-1724, -3800, 2737, 5213, -3699, -101, 400, -39, -8, 1]>],Snew);
    return Vf;
end function;