S2 = [(1/2) + (1/6)]*7
S4 = S2 + 7 [(1/24) + (1/120)]
S6 = S4 + 7 [(1/720) + (1/5040)]
S2 = [(1/2) + (1/6)]*7
S4 = S2 + 7 [(1/24) + (1/120)]
S6 = S4 + 7 [(1/720) + (1/5040)]
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