fold: discussion page states the model is incorrect. Had I not found
the little lie to be initially enlightening (The TeX Book, Knuth) , I'd
have changed the page. I think the fcap page needs change.
Fold single examples:
Forward (dyad): 0 U F.. V 2 3 4 is equivalent to U 4 V 3 V 2 V 0
Reverse: U F.: V 2 3 4 is equivalent to U 2 V 3 V 4 (false)
is U@V , else Z: in U would be ineffective.
Forward (dyad): 0 U F.. V 2 3 4 is equivalent to 4 U@V 3 U@V 2 U@V 0
Reverse: U F.: V 2 3 4 is equivalent to 2 U@V 3 U@V 4
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