: subseq-index ( seq subseq -- i/f ) [ 0 ] 2dip subseq-index-from ; inline
-: subseq-index? ( seq subseq -- ? ) subseq-index >boolean ; inline
+: subseq-of? ( seq subseq -- ? ) subseq-index >boolean ; inline
: subseq-start-from ( subseq seq n -- i/f )
spin subseq-index-from ; inline deprecated