The constraint for Philadelphia is:

A) X13 + X23 - X35 - X36 - X37 = 0.
B) X13 + X23 - X35 - X36 - X37 ? 0.
C) X13 + X23 + X43 - X34 - X35 - X36 - X37 = 0.
D) X13 + X23 + X43 - X34 - X35 - X36 - X37 ? 0.

Answer: C

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