description: sselect[k1, k2] seq select the k1'th to the k2'th elements from the given sequence indices start from 1, not 0 final element has index -1, 2nd last element -2, and so on. examples: sselect[2,2] ssplit |abcdefgh> |b> sselect[2,3] (|a> + |b> . |c> + |d> . |e> . |f> + |g> + |h> . |i> + |j>) |c> + |d> . |e> sselect[4,7] ssplit[" "] |a b c d e f g h> |d> . |e> . |f> . |g> sselect[3,-3] ssplit[" "] |a b c d e f g h> |c> . |d> . |e> . |f> see also: select