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Elements of the group are displayed as words in the presentation $\langle a, b, c, d \mid a^{6}=b^{5}=c^{15}=d^{15}=[b,c]=[b,d]=[c,d]=1, b^{a}=bd^{6}, c^{a}=bc^{7}, d^{a}=b^{3}cd^{7} \rangle$ .
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