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A지점 f1+f4 = 15B지점 f1= f2+10C지점 f2+f3+5 =30D지점 f4+20 = f3
f1+f4 = 15f1-f2 = 10f2+f3 = 25f3-f4 =20
1 0 0 1 15 1 -1 0 0 100 1 1 0 250 0 1 -1 20
1 0 0 1 15 0 1 0 1 50 0 1 -1 200 0 1 -1 20
1 0 0 1 15 0 1 0 1 50 0 1 -1 200 0 0 0 0
1 0 0 1 15 0 -1 0 -1 -50 1 1 0 250 0 1 -1 20
f1 15f2 5f3 20f4 0
1 0 0 1 15 1 -1 0 0 100 1 1 0 250 0 1 -1 20