10
10
S4-S3/S=7S
+WW4WW*WW6
5WW/WW4WW/
S-1SS2S9=3
/WW=WWSWW=
1WWSWW=WW4
7+3S4SS+1S
=WW3WW0WW-
1WW-WW/WW2
S9-S2=S6/S