
// Make newform 7942.2.a.bq in Magma, downloaded from the LMFDB on 05 May 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_7942_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_7942_2_a_bq();".
// 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_7942_2_a_bq();".
// 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 := [80, 120, -235, -65, 116, 14, -19, -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, 1, 0, 0, 0, 0, 0, 0], [-5, 0, 1, 0, 0, 0, 0, 0], [-220, -3635, 1275, 2460, -334, -427, 23, 21], [2060, 1855, -3175, -580, 822, -9, -59, 7], [1220, -515, -525, -460, -6, 157, 7, -11], [-420, -885, 325, 660, 6, -157, -7, 11], [-1580, -11215, -425, 8140, 794, -1543, -93, 89]];
    Rf_basisdens := [1, 1, 1, 800, 200, 200, 200, 800];
    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_7942_a();"
function MakeCharacter_7942_a()
    N := 7942;
    order := 1;
    char_gens := [5777, 6139];
    v := [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_7942_a_Hecke(Kf)
    return MakeCharacter_7942_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, 1, 0, -1, 0, 0, 0, 0], [0, 0, 0, 0, -1, 0, 0, 0], [1, 0, 0, 0, 0, 0, 0, 0], [0, 0, 1, 1, 0, 0, 0, 0], [-1, 0, 0, 1, 1, -1, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0], [-1, 0, 0, 1, 0, 0, 0, -1], [-2, 1, 0, 2, 0, 0, 0, -1], [0, -1, 0, 0, 0, -1, -1, 0], [-2, 0, -1, -4, -1, 0, 1, -1], [2, -1, -1, 0, -2, 0, -1, -1], [0, 2, -1, -1, 0, 0, -1, 1], [-1, -1, 0, 1, 0, 0, 1, -1], [6, -1, -1, 0, -1, 1, -1, -1], [0, -1, -2, 2, -2, 0, 0, -2], [-3, 2, -2, 1, -1, 0, 1, 0], [1, 4, 0, -1, 1, -1, 0, 1], [1, 0, 0, -1, 0, -1, -1, 1], [-2, -2, 0, 1, 0, 0, -1, -2], [2, 2, 1, -1, 1, -1, 1, 1], [-2, -1, 0, 2, 1, -1, -2, -2], [3, 1, 1, -3, -1, -1, 1, 2], [6, 1, -1, 1, 0, 1, 0, 0], [-2, 0, -2, -1, -1, 2, -2, 0], [-6, 0, -1, 5, -3, 1, 3, -1], [6, -1, 0, -6, 0, 0, 1, 2], [3, 0, 0, 0, 1, 1, -1, -1], [-2, -3, 1, -1, 1, 0, -1, 2], [-2, 0, -1, -3, 1, 0, 2, -1], [3, 2, 2, -9, 1, 0, 2, 1], [3, -1, 3, -1, 2, -1, -3, 0], [10, -2, 2, 0, 2, 0, -1, 0], [-5, 4, -1, 0, -3, 1, 3, -3], [1, -3, 2, -7, 2, -1, -1, -1], [-6, 0, -2, 4, -2, 2, 1, 1], [-2, 0, 0, 6, 0, -1, 0, -2], [5, -2, 1, 0, 0, 2, -4, 0], [12, -1, 4, -5, 2, -1, -2, 0], [-4, -1, 2, 6, 1, -3, 1, 2], [-6, -5, 0, 8, 0, 0, -2, 0], [0, 2, -2, -6, -3, 1, 1, 2], [4, 2, -2, 0, -1, -1, 4, 0], [3, -5, 0, 5, 0, 1, -2, 0], [0, -3, 1, 1, 0, 2, 3, -1], [10, -1, -2, 0, 1, 0, -3, 0], [0, 3, -2, 2, 0, 1, 2, 2], [0, -5, 0, 0, -1, 1, -3, -4], [0, -3, -1, -6, 3, -1, 1, 1], [-11, 0, -1, 6, -5, -1, 4, -1], [-6, 1, 1, 3, 1, 0, 3, -3], [5, 1, 1, 2, 1, 1, -2, -2], [10, 0, -2, -8, 1, 2, -2, 0], [-3, 0, 1, -5, -1, 3, 3, 0], [-2, 0, 1, -1, -3, 2, 3, 1], [13, -4, 1, -4, 1, 0, -1, 5], [4, 1, -1, -1, -2, 1, 0, -3], [-5, 4, 0, 4, -2, -2, -2, -1], [5, -3, -1, 2, -3, 1, -1, -1], [-3, -3, 0, -1, 3, 0, 2, 5], [17, 0, -1, -4, 1, -2, 0, 0], [4, -3, 1, -3, -1, 3, 2, -1], [4, 3, 4, -4, 1, -2, 3, 0], [1, 4, 0, 2, 1, -1, 5, 5], [7, 1, -3, 1, 0, -2, 0, -2], [-15, 0, 2, 17, 1, 1, -2, -1], [9, -7, 2, -4, 3, 0, -6, 3], [-4, 4, 1, 5, 2, 3, -2, 3], [-1, -1, 2, -5, -2, 1, 4, -2], [3, -2, -1, 4, -1, 4, 0, -3], [-4, 1, -1, -1, -4, 0, -2, 1], [2, -1, 1, 3, -1, -3, 3, -3], [3, 5, 3, -4, 2, -4, -1, 1], [-6, -2, 3, -3, 0, -1, 3, -1], [-2, -6, 0, 10, -2, 3, -1, -2], [-2, -4, 0, -6, -6, 3, -4, -1], [-15, -1, -2, 7, -2, 2, -1, 1], [6, -4, -3, -3, 0, 2, 0, -1], [4, -5, 4, -5, 1, 0, 0, 0], [3, -1, 5, 2, 3, 0, -5, -2], [-7, 5, 0, 2, 2, -3, -3, -3], [8, 0, 2, -2, -1, 4, 0, 2], [7, 7, 0, -12, 1, -3, 3, -1], [8, -3, 2, 2, 0, 3, 3, -2], [-12, 5, -1, 11, -1, 2, 2, 1], [-13, 5, -4, -3, 0, -3, 2, -4], [0, -2, 3, 2, -4, 0, 4, 1], [0, 2, 3, 5, 0, -4, -3, 3], [4, 0, 3, -17, 0, 0, 0, 1], [10, -8, 1, -9, 4, 0, -5, 1], [3, 3, -1, -4, -3, -2, 7, 0], [-8, 1, -2, -2, -2, -2, 4, -2], [6, 0, 2, 0, 0, 4, 1, 4], [-5, -7, -2, 7, 5, 0, -9, -3], [-5, 1, 0, 1, 2, 0, -2, 3], [2, 2, 3, 5, 2, -1, -2, 0], [-1, 1, 0, 9, -3, 1, -5, 4], [-3, -6, 0, 7, -1, 2, -2, -3], [-11, -4, -1, 2, 2, -1, -8, -5], [10, 3, -1, -3, 0, 2, -1, -1], [7, -1, 4, -9, -4, 1, 4, 1], [20, 7, 2, -10, 0, -3, 2, 2], [1, -2, 0, 6, -3, 0, 3, -3], [-2, -2, 0, 6, 4, 0, 5, 2], [1, 0, -1, -14, -4, 4, -1, -1], [0, 0, 1, -7, 4, -8, -2, 3], [6, -5, 0, -11, 3, -3, -7, -2], [4, 2, -2, 2, -1, 2, 0, -2], [-7, 10, -3, 10, 4, -3, 1, -2], [18, -8, 0, -18, 2, 2, -2, 2], [12, 2, -3, -12, 3, -4, -1, 3], [1, -6, -2, -5, -1, 1, 3, 5], [20, 6, -1, 7, 4, -3, -4, 1], [-4, -5, 0, -4, -2, -4, 3, 4], [-7, 2, -3, -4, 1, -1, 9, 1], [20, -2, -1, -1, 1, 3, -5, -3], [1, -7, 2, -15, -1, 0, -4, -1], [-12, -6, 0, -1, 4, 0, 0, 0], [10, 3, -3, -1, -5, 2, 2, -3], [-5, 0, -2, -11, -5, 0, 6, 3], [5, 2, -2, 4, 5, -2, 4, 7], [3, 1, -2, -5, -4, 1, -1, 6], [16, 4, 4, 4, 3, -3, -4, 0], [5, -7, 3, -2, -1, 1, -5, -2], [3, -7, 1, -3, -5, 4, -2, -6], [-22, -8, 3, 13, 4, -2, -3, 0], [-3, 0, -3, 0, -9, -1, 4, -4], [9, -3, 1, -20, 1, 1, -6, 0], [-16, 1, -6, 2, -4, 1, 2, -1], [-6, 5, -2, 0, -2, 3, 3, 0], [4, 2, -2, 2, -7, 1, -1, -2], [1, 3, 3, -14, 5, 0, 3, -2], [-1, 2, 4, -7, 1, 2, -2, 0], [-9, 5, 3, -6, 7, -3, 3, 2], [12, 3, -6, -3, -1, -2, -2, 2], [-1, 7, -2, -5, 0, -3, 1, -2], [7, -7, 5, -6, -1, 1, -7, -2], [14, 0, 4, 10, 3, -2, 0, 7], [-13, -9, 3, 15, -1, 2, -3, 0], [-16, 0, -3, 9, 1, -1, -2, 3], [-4, 6, 4, -8, 3, 3, 0, 1], [14, -5, 0, 2, 1, 2, 2, -2], [12, 5, -8, -8, -2, -1, 6, 0], [3, 3, 6, -14, 3, 0, 4, 1], [3, 0, 4, -3, -1, 1, -3, -1], [6, 1, -2, 8, 0, 0, 4, 5], [13, 4, 1, 0, -1, -1, 6, 1], [-1, -7, 1, 10, 0, 6, 0, -6], [5, -5, -3, 8, 5, -7, 1, 4], [7, 2, 0, -11, 2, -2, 0, 8], [-9, 2, -3, 5, 3, -3, 5, 6], [4, -4, 6, -6, 0, 2, -5, 2], [32, -7, 0, 4, 1, 2, 0, -4], [-10, -6, -1, -3, -2, 2, -7, -5], [12, 1, -2, 2, 5, 0, -3, 2], [19, 2, -5, -8, 2, -2, 1, 4], [15, -6, 3, -8, -2, -1, 0, 5], [5, 11, 7, -8, 3, -3, -4, 0], [16, 3, 2, -8, 3, 0, -5, 0], [1, -3, -1, 14, 1, -1, -4, -2], [-26, 7, -3, 31, 1, 2, 3, -2], [-11, -5, 4, 15, -2, -2, 1, 1], [-1, 7, -4, 5, 0, 0, -1, -1], [20, 7, 5, -24, 7, -3, -1, 3], [-9, -4, 5, 6, 4, -4, -5, -6], [9, -1, 3, -14, -4, 3, -2, -6], [-7, 6, 5, -5, 4, -3, 8, 4], [11, 0, 5, -6, 0, 1, -2, -1], [-9, -10, 2, -1, -3, 5, 2, -2], [4, -4, 2, -14, -7, 3, -2, -2], [-2, 7, -8, -8, -5, 4, 3, 0], [3, 2, 3, 8, 0, -3, -5, 4], [14, -11, 0, 1, 7, -1, -7, -2], [-4, 0, 4, 4, -8, 3, 5, -8], [4, -1, -2, 14, -6, 3, 3, -5], [0, 5, 1, -3, 10, -4, -1, -1], [8, 6, -5, -9, -2, -1, 11, -2], [17, -16, -1, -6, -2, 6, -8, -6], [-5, -7, 9, 2, 4, -4, -6, -1], [-2, -2, -4, 10, 2, -4, -13, 2], [20, 9, 0, -16, 1, 4, 6, 0], [-9, -6, 0, 5, -1, 6, -5, -4], [-5, 2, -1, -5, 7, -3, 1, 4], [-11, 5, -6, 13, 0, -4, -3, -5], [18, -2, -2, -1, 0, -4, 8, 0], [-5, -5, -1, 7, 0, 5, -3, 4], [10, 9, 4, 6, 6, -3, 9, 10], [4, -8, -1, 3, -6, -1, -3, -6], [-22, -1, 4, 10, 2, -4, -1, -6], [5, 9, 1, -1, 1, 3, 0, 0], [-2, -6, 1, -9, -3, 3, -7, 5], [-8, -2, -3, -3, 4, -3, 1, -1], [-7, 3, 3, 1, 1, 3, 5, 2], [6, 12, 2, -8, 6, -7, 7, 0], [12, -1, 2, 8, 3, -3, 5, 4], [-14, 8, -8, 22, 3, 1, -2, -5], [33, 6, -2, -8, -2, -2, 0, 3], [-5, -3, 2, -17, -2, 2, 5, 2], [1, -10, 0, 15, 2, 3, -5, -3], [-17, -6, 0, 13, -2, 5, -3, 0], [-21, -9, -2, 11, -6, 4, -5, -3], [20, 0, 2, -26, 2, 0, 1, -1], [23, 3, 3, 4, 3, -1, -2, -3], [-20, -6, -8, 16, -5, 0, -3, -4], [-6, 4, 1, -6, 4, -4, -9, 1], [-16, -1, -1, 15, 0, -1, -6, 5], [35, 1, -2, -13, 2, 0, 4, 5], [-5, -4, 5, 9, -1, -5, 10, 2], [-7, 7, 6, 9, 4, -2, 7, 7], [2, 8, 0, -19, -2, 5, 6, -6], [0, 0, -5, -22, 1, 0, -5, -3], [18, -3, 4, -10, -2, 4, 2, 6], [-6, -7, 4, 14, 5, 2, -4, 2], [4, 4, 1, -15, -2, 2, 0, 7], [-15, 9, -4, -5, -3, -1, -4, -2], [-1, -7, 9, 2, -3, 3, 7, -2], [-3, 4, 5, -4, -1, 1, -3, -3], [-20, -7, 3, 19, -2, 8, -2, 1], [2, -12, -1, 12, -2, 7, -5, -1], [-5, -12, -2, 1, -4, 0, -5, -1], [-4, -2, 4, 16, 0, -3, 7, 4], [-9, -2, 3, 16, -6, 1, 11, -7], [1, 9, -6, 9, -9, 2, 8, -9], [-8, -10, -1, 7, 5, -4, -13, -7], [-23, 5, 3, -3, 0, 4, -7, 2], [-8, 2, -2, 10, -3, 7, 7, 3], [11, -5, 5, 2, 9, -6, -10, 2], [-6, -6, 2, 0, 0, -3, 0, 8], [9, -6, -4, 15, -7, 2, -3, 9], [12, 4, -2, -12, -3, -1, 5, -8], [-4, -1, 1, 9, 1, 1, -1, -5], [-17, 2, 2, 19, 3, 6, 5, 5], [-2, 12, 1, -11, -5, 1, 11, 3], [6, -10, -4, 10, -2, 2, -2, -10], [16, 6, -4, -8, 5, -1, 5, 4], [17, -10, 6, -3, 0, -7, -6, 12], [-14, -3, 8, 20, 3, 0, 2, 0], [13, 1, 2, -3, 2, 0, -7, -1], [-14, -5, -4, 22, 5, -4, -2, -2], [-19, 3, 6, 13, 7, -6, 8, 3], [0, 3, -2, -2, 3, 0, -10, -6], [-2, 6, 2, -4, 5, 1, 0, -8], [-20, -13, 0, 3, -2, 1, 1, -4], [10, 13, 0, -6, -3, -3, 16, 7], [2, 1, -6, 0, -5, 6, -2, 0], [10, -5, 3, 9, 1, 3, -1, 7], [34, -2, 9, -17, 0, -3, 1, 1], [-8, 0, 3, 11, 4, 3, -5, -3], [2, 7, 4, -6, 0, -2, 10, 10], [-10, 3, -5, 8, -3, -1, -3, -9], [11, 8, 6, -6, 7, -4, -8, 5], [-3, -8, 0, -1, -11, 1, 3, 1], [-16, -7, 2, 22, -2, 4, -6, 3], [11, -16, -1, 10, -3, 2, 1, -2], [4, 8, 2, 14, 1, -4, 13, 6], [-16, -7, 1, 16, -7, 8, 2, -1], [-8, -3, -1, 23, -3, 3, -5, 1], [35, 5, -6, -11, -3, 4, 0, 3], [-12, -1, 2, 24, -7, -3, -6, 0], [-9, -3, 0, 1, 4, -1, -6, 11], [-1, 6, -12, 9, -6, 5, -1, -5], [1, -1, -7, -6, -3, 8, -1, -2], [-3, 10, -6, -9, -7, -3, 1, -7], [-21, -13, -1, 16, 3, -5, -11, -3], [-26, 3, -2, 12, 0, 5, -5, 0], [-35, 9, -7, 22, -5, 6, 10, -2], [16, 6, 1, -3, 2, -6, -3, 12], [10, -2, -1, 5, -7, -5, -11, -5], [-8, -4, -2, 32, 1, -1, 7, 4], [-17, 4, 2, 6, -5, -8, 2, 5], [3, 9, -4, 1, -11, 1, 2, -5], [34, -12, 9, -21, -2, -2, -6, 2], [-14, 9, -6, -12, 0, -7, 9, 0], [1, -6, -2, 20, -1, -4, -1, -1], [-21, -1, -2, 19, 5, 0, 7, 1], [-4, 5, 0, 8, 1, -7, 2, 4], [-17, -10, -10, 14, -13, 7, 1, -3], [-20, -10, -5, 7, 8, 1, -11, -6], [-10, 2, 1, -29, 7, -5, 1, 1], [-5, -9, 1, 10, -1, 0, -15, 2], [-14, 4, -9, 5, 1, -1, 5, 11], [5, 11, -9, -2, -4, 0, 6, -2], [-18, -9, 0, 10, -2, 4, -5, -13], [-9, -11, -5, -4, -1, -3, -6, -8], [-7, 7, 4, -17, 8, -4, -4, 1], [10, -1, 2, 23, 10, -9, 2, 0], [7, -3, -3, -2, 5, -10, -4, 3], [3, -5, -3, 14, 0, -2, 1, 14], [2, 1, -3, 13, 6, -4, -2, 7], [-15, -9, 2, -11, -8, 9, 2, 0], [-1, 4, 1, 22, -6, 4, 2, 6], [18, 8, 1, -22, 8, 3, -5, 5], [8, 13, -3, 9, 9, -7, 6, 3], [-6, 7, 6, -16, -3, 6, 1, -3], [-13, 11, 3, 3, -1, 4, 0, 0], [6, 10, 5, -21, 3, -4, 9, 5], [7, -6, 8, 23, 6, 0, -6, 5], [-5, -7, 8, -7, 12, -8, -4, -1], [-5, 3, 11, -4, -2, 7, -8, -4], [-6, 3, 2, -13, 1, 4, 8, 0], [15, 7, 3, -12, 7, 3, -5, -3], [-5, 11, -6, -1, -3, -2, 12, 9], [-3, 9, -1, -2, 4, 0, 1, -6], [-13, -5, -2, -9, -6, 0, -10, -3], [-17, -10, -3, 10, 8, 0, -8, 7], [23, 2, -2, 7, 1, -3, -5, -7], [-4, 2, 3, 22, 0, 7, 4, 1], [-1, -1, -1, -4, 9, 4, -4, -4], [-10, 4, -4, -15, -10, 3, 11, 2], [-6, 4, 5, -5, 0, -5, 9, 9], [11, 0, 7, -6, -3, -4, 7, -2], [10, 2, 4, -19, 3, -2, 5, 6], [12, 6, -2, -10, -6, 0, 10, -6], [6, -13, -5, 29, -3, 1, -1, -5], [-23, 4, 7, 46, 2, -4, 1, 3], [18, 5, -2, -16, 1, -4, 11, 12], [-9, 0, 0, 5, -3, 6, 14, 3], [-4, -1, -8, -12, 3, 1, 3, 5], [-22, 8, -4, 9, 3, 6, 5, -10], [-17, 6, -1, -8, 1, 4, -8, -4], [4, -3, 1, -11, -6, 1, -15, -12], [16, 1, 8, -21, 6, 3, 4, 0], [0, -1, 1, 13, 1, -5, -5, 7], [-5, 4, 9, -11, 12, -1, 1, 2], [7, -5, -4, -35, 5, -2, -3, 0], [22, -1, 8, -2, 8, -5, -14, 2], [-21, 0, 5, 18, -6, -4, -9, -2], [-12, 11, -10, -6, 6, -4, 9, -2], [-30, -6, 3, 21, 3, -2, -1, -8], [-13, -3, -4, -8, 3, 4, -5, -5], [-11, -13, 9, 30, 5, 9, -6, 2], [-11, -15, 1, -8, -9, 5, -4, -12], [-3, -10, 5, 0, 3, 6, -4, 4], [4, 4, -6, 2, -5, 8, -1, -6], [2, 8, -1, -27, 2, 4, 9, -13], [-11, 0, 5, 4, 0, -11, 5, 5], [-14, -7, -1, 20, -7, 1, -12, 7], [7, -5, 2, 7, 2, -9, 1, -2], [-16, -11, 2, 26, 12, 1, -7, -2], [-16, -3, 10, -8, 1, -2, -12, 4], [-14, -5, 5, 21, 2, 9, 1, -9], [-8, -9, -4, 18, -3, 11, -2, -10], [28, 9, 6, -2, -7, -5, -5, -6], [17, -5, 1, -8, 4, 2, -7, -3], [20, -7, -1, -9, 4, 1, -6, 5], [-28, 14, 2, 13, 2, -3, 2, 2], [7, -6, 11, 0, 8, -3, 2, 0], [-23, -5, -2, -19, 1, -2, 5, 3], [-29, 0, 0, 5, -12, 5, 7, 0], [-27, 8, -10, 25, -8, 4, 7, -9], [-10, -7, -1, 4, 9, -5, 1, 3], [2, -2, 1, 15, -7, -2, -1, 2], [23, -10, 7, -28, -3, 1, 2, 4], [3, 3, -8, -7, -5, -2, 8, 4], [25, 0, -8, -14, 7, -2, -1, 5], [11, -4, 0, 5, -2, -2, -11, 3], [27, -14, 0, -3, 2, -2, -3, -1], [-5, -5, -3, -7, 4, 2, 10, -6], [15, -5, 1, -22, -1, 9, 6, -2], [14, -8, 2, -20, -15, -1, -5, 5], [-22, 3, -2, 16, 3, 0, 4, 1], [-30, 1, -7, -1, -6, -1, -4, -7], [18, -11, 8, -18, 5, -3, -13, -2], [35, 10, -2, -9, 7, -7, 0, 5], [21, 3, 3, -2, 8, -5, -4, 15], [13, -5, -2, 7, 3, -3, -15, 1], [34, -11, -3, -17, 7, 8, -1, -7], [-27, -1, 0, 11, 12, -6, 2, 2], [14, -7, -2, -4, -2, 6, -8, 4], [-5, 18, -9, 8, -13, 9, 11, 4], [16, 3, -3, 1, 0, -7, -8, -1], [-14, 17, -7, -3, -2, 4, 0, -1], [24, -1, -9, -5, -8, 2, 12, 13], [6, 22, -1, -7, 9, -7, 11, 4], [-6, -1, 5, -5, 7, 2, -12, 5], [-12, 3, -8, 28, -2, -4, 7, -4], [21, -5, -3, -4, 2, 3, 6, 1], [-1, -3, -5, 7, 13, -6, 5, 4], [26, -12, -2, 8, -8, 3, 1, 1], [-19, -8, -2, 37, 1, -4, -3, 0], [25, -11, -9, 9, -5, -1, 4, -2], [9, 1, 4, -9, 2, -7, -10, -3], [-31, 7, 10, -12, -7, 8, 7, -1], [13, -8, -8, -9, 9, -2, -5, 1], [-6, 2, 2, -24, 5, 2, 10, 0], [-6, -9, 2, -12, 0, -4, 6, 8], [-3, -6, 6, 13, 11, -4, -4, 8], [19, -5, 2, -21, -7, 4, 4, -7], [-7, -1, 0, 15, 6, 4, 2, -11], [-20, 2, 3, 3, -4, -2, 12, -2], [13, -7, -3, 7, 3, -3, 3, -12], [7, 6, 1, -42, 3, 1, 6, -2], [19, 17, 5, 10, 2, -4, 1, 6], [-11, -7, 3, 10, 3, 5, -13, 2], [-29, 2, 0, -15, 12, -4, -4, 4], [24, 22, 4, -16, 4, -5, 17, 16], [-37, 3, 1, 16, 0, -5, 8, 4], [-21, -14, 11, 16, -6, 7, -8, -12], [9, 4, -9, -10, 2, 6, -11, 3], [-30, -8, -8, 29, -8, 6, 4, 2], [12, 1, 0, -1, 1, -5, 1, -8], [16, -8, 7, 3, -10, -8, 2, 5], [17, -2, -5, -6, 1, -1, 14, 3], [-2, 6, 6, 27, 5, -2, -2, 8], [-11, 2, -5, -30, -2, 4, -5, -10], [3, -5, 1, -14, -9, 12, -5, -1], [54, 4, -1, -23, -6, -3, -1, 0], [25, -7, 1, 0, -4, -1, -5, 0], [23, 6, -9, 8, -15, 7, -2, 4], [3, 8, 1, -10, 4, 1, 17, 11], [-17, 21, -4, -7, 1, -7, -6, 8], [42, 11, -1, -15, -6, 1, 5, -5], [34, -1, 2, 16, -10, 1, 7, 0], [-32, -3, -2, 13, -3, -13, -9, 2], [27, -6, 4, -29, -1, -1, -3, 13], [-15, 4, 3, -18, -2, 1, 23, -2], [-39, 3, -7, 20, 5, -2, -3, -4], [-49, 3, 9, 29, 6, 3, 4, -6], [-16, 17, -8, 24, -2, -1, 20, -4], [-23, -2, 3, -22, 7, 0, 5, -5], [-26, 2, -4, 17, -6, 4, 13, 6], [3, -24, 5, 2, 3, 0, -14, 2], [10, 6, -11, 3, -8, 1, 8, -7], [-6, -13, -6, 7, -3, 1, 16, 8], [-32, 0, 3, 46, 1, -7, 7, 1], [6, -20, 10, 12, 7, 0, -12, 8], [-13, -4, 6, 30, 9, 1, 13, 5], [-1, 0, 1, 10, 13, 1, 5, 10], [-17, -18, 15, 16, 4, -5, 1, 0]];
    aps := ConvertToHeckeField(raw_aps);
    chi := MakeCharacter_7942_a_Hecke(Universe(aps));
    return ExtendMultiplicatively(weight, aps, chi);
end function;


// To make the newform (type ModFrm), type "MakeNewformModFrm_7942_2_a_bq();".
// 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_7942_2_a_bq(:prec:=8)
    chi := MakeCharacter_7942_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_7942_2_a_bq();".
// 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_7942_2_a_bq( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_7942_a();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<3,R![80, 120, -235, -65, 116, 14, -19, -1, 1]>,<5,R![-19, -216, -87, 180, 76, -45, -18, 3, 1]>,<13,R![121, -994, -1387, 220, 606, 45, -48, -3, 1]>],Snew);
    return Vf;
end function;