: ?register ( acc seq -- )
complete rotate-bits
- dup [ 2 N ^ mod ] map all-unique? [ infimum swap push ] [ 2drop ] if ;
+ dup [ 2 N ^ mod ] map all-unique? [ minimum swap push ] [ 2drop ] if ;
: add-bit ( seen bit -- seen' t/f )
over last 2 * + 2 N ^ mod