" <-APL2-------------------- sam184.txt ---------------------------->
" <- vector notation, nested variables ----------------------------->
  'a' 1
" following s/b nested, rank 1, 2 elements
  RL#'ab' 1
" following s/b vector, rank 1, 3 elements
  RL#'ab',1
" following s/b vector, rank 1, 3 elements
  RL#('ab' 'cd'),1
" <- enclose ------------------------------------------------------->
" following s/b scalar, rank 0
  RRL#`Z 1 2
)off