[ [ i ] unless* ] change-nth-unsafe ; inline
: normal-suffixes ( zs -- ss )
- [ length [ f <array> ] [ [1,b) ] bi ] keep pick
+ [ length [ f <array> ] [ [1..b) ] bi ] keep pick
[ (normal-suffixes) ] 2curry each ; inline
:: (partial-suffixes) ( len old elt i -- len old/new old )