$$u^{7}-3u^{6}+4u^{2}+2-u^{6}-u-4$$
$u^{7}-4u^{6}+4u^{2}-u-2$
$$u^{7}-4u^{6}+4u^{2}+2-u-4$$
$$u^{7}-4u^{6}+4u^{2}-2-u$$
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$7u^{6}-24u^{5}+8u-1$
