1.Step
3   1'1'   77    1'1'   77    2'
2.Step
3   34     45    1 7 5 6 (x2)
3.Step 
33  33     1 2  33 33 1 2 44 44
4.Step
7  7    6 7  1'1'  2'3'  7 7  656 656
5.Step
(3 3')  (3 3')(3 3')(3 3')(3 3')  (3 3')
(4 4') (4 4')(4 4')(4 4')(4 4')  (4 4')
(55') (55')(55')(55')(55') (55') 
1''7'5'6'  6'6'6'6'