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  1. Chained comparisons

  2. 

  3. The unit "cmp.fs" contains words to facilitate chained

  4. comparisons with a single reference number. This allows, for

  5. example, to easily express "a == b or a == c" or "a > b and a <

  6. c".

  7. 

  8. The way those chained comparison words work is that, unlike

  9. single comparison operators, they don't have a "n1 n2 -- f"

  10. signature, but rather a "n1 f n2 -- n1 f" signature. That is,

  11. each operator "carries over" the reference number in addition

  12. to the latest flag.

  13. 

  14. 

  15. 

  16.                                                         (cont.)