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b) -10
c) -22
d) 12
e) 60
f)-160
9. -1
-1
-1
-1
14.
(-1) --- (-2) ---- 1 --- (-3) --- 3
(-1) ------- 10 ----- 2 ------ (-4) ------- (-1)
12 ----- (-3) --- (-4) ---- 9