10
10
0WS*S-4S=S
+WWW+WW5WW
SW5=S-2S/5
*W*W=WW/W9
S/S=S5/SW+
=W5W8WW0WS
5W=W-WW=W=
S=1+S7/SWS
WW2WWWWWW*
7*S=S0/SW7