$$a ^ { 4 } - a ^ { 3 } - a + 1 a ^ { 4 } + a ^ { 2 } + 1$$
$2a^{4}-a^{3}+a^{2}-a+1$
$$2a^{4}-a^{3}-a+a^{2}+1$$
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$8a^{3}-3a^{2}+2a-1$
