--- each_strongly_connected_component {|nodes| ...}
#    is the iterator version of the strongly_connected_components method.
#    obj.each_strongly_connected_component is similar to
#    obj.strongly_connected_components.each but
#    modification of obj during the iteration may cause unexpected result.

    strongly_connected_components ᥽åɤΥƥ졼ǤǤ
    obj.each_strongly_connected_component 
    obj.strongly_connected_components.each ˻Ƥޤ
    ֥åɾ obj ѹ줿ͽʤ̤ˤʤ
    Ȥޤ

#    each_strongly_connected_component returns nil.

    each_strongly_connected_component  nil ֤ޤ

