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Riffle

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Riffle[list, x]

inserts a copy of x between each element of list.

Riffle[{$a_1$, $a_2$, ...}, {$b_1$, $b_2$, ...}]

interelements the elements of both lists, returning {$a_1$, $b_1$, $a_2$, $b_2$, ...}.

• • Riffle[{a, b, c}, x]

• • Riffle[{a, b, c}, {x, y, z}]

• • Riffle[{a, b, c, d, e, f}, {x, y, z}]