clone	clone
current	current
is_Iterator	is_Iterator
Iterator	Iterator
move	moves
move_more	moves
move_next	moves
move_while	moves
range	range
sets	funs
that_for_all	funs
that_for_any	funs
we_have	funs
yield	yields
yield_more	yields
yield_next	yields
yield_while	yield_while
