15: J=Y1-J1-X1/L*(J2-J1):K=Y2-K1-X2/L*(K2-K1)
20: A=X2/L:B=1-A:G=X1/L:D=1-G
25: IF G>=A LET F1=G:F2=B:F3=A
30: IF A>G LET F1=A:F2=D:F3=G
35: I=J1*(2*K1+K2)+J2*(K1+2*K2)+K*(J1*(1+B)+J2*(1+A))+J*(K1*(1+D)+K2*(1+G))
40: IF J*K<>0 LET I=I+J*K/F2/F1*(2*F1-SQU F1 - SQU F3)
45: I=I/6*L: PRINT I: GOTO "H
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