$$ERRFRRRRR$$
$EFR^{7}$
$$ER^{2}FRRRRR$$
$$ER^{3}FRRRR$$
$$ER^{4}FRRR$$
$$ER^{5}FRR$$
$$ER^{6}FR$$
$$ER^{7}F$$
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$FR^{7}$