description:
show-many sp
returns the number of superpositions in a sequence
examples:
show-many |>
|number: 0>
show-many ssplit[" "] |a b c d e f g>
|number: 7>
show-many (|a> . |b> + |c> + |d> . |e> + |f>)
|number: 3>
see also:
how-many, measure-currency