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Elements of the group are displayed as words in the presentation $\langle a, b, c, d \mid b^{2}=c^{4}=d^{84}=[a,b]=1, a^{2}=d^{42}, c^{a}=cd^{42}, d^{a}=c^{2}d^{71}, c^{b}=cd^{42}, d^{b}=d^{83}, d^{c}=d^{43} \rangle$ .
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