Iterator                Making an Irregular Sequence Iterator
clone                   clone
current                 Get the current value of an Iterator without
                        changing its state
is_Iterator             Test if an object is an Iterator
move                    Increment an Iterator Without Returning the
                        Value(s)
range                   Python-style range function
sets                    R Set Comprehension
yield                   Increment an Iterator and Return the Next
                        Value(s)
yield_while             yield_while
