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$at (S n -- S')
$mul (S n -- S*n)
$sybs (S -- t[S'0, S'1, S'2, ..., S'n])
$sub (S x y -- S')
$sep (S S1 -- t(...))
$rep (S S1 S2 -- S')
$repn (S S1 S2 n -- S')
$repm (S S1 S2 -- S')