$$TENGOUNPROBLEM$$
$BGLMPRTU\left(ENO\right)^{2}$
$$TE^{2}NGOUNPROBLM$$
$$TE^{2}N^{2}GOUPROBLM$$
$$TE^{2}N^{2}GO^{2}UPRBLM$$
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$BGLMPRU\left(ENO\right)^{2}$