@lace(t:tab, n:numeric)
builds a new tab whose elements are interlaced sequences of the elements of the t subcollections, up to size n.
       @lace([[1, 2, 3], 6, ["foo", "bar"]], 9)
       [1, 6, "foo", 2, 6, "bar", 3, 6, "foo"]
the first elements is taken in the first element of t, the second in the second element of t, etc., in a cyclic way, until 9 elements have been acquired. Scalar elements are extended to tab of constants and element in a subcollection are taken modulo the size of the subcollection.

See also Tab Manipulations @binary_search    @car    @cdr    @clear    [@clone]    @concat    @cons    @copy    @count    @dim    @domain    @drop    @empty    @find    @flatten    @gnuplot    @insert    @iota    @is_list    @is_prefix    @is_subsequence    @is_suffix    @lace    @last    @listify    @map    @max_val    @median    @member    @normalize    @occurs    @parse    @permute    @push_back    @push_front    @range    @reduce    @remove    @remove_duplicate    @replace    @reshape    @resize    @reverse    @rotate    @scan    @scramble    @size    @slice    @sort    @sputter    @stutter    @succession    @tab_history    @tab_history_date    @tab_history_rdate    @take    @to_num