Answer:
anything not matching PS, where S ∈ {O, Q, X, Y}
Step-by-step explanation:
A segment that is a side of ∠OPQ will have P as one end of it. The other end will be any of the remaining points except Z. The points may be listed in either order: XP is a side of the angle, as is PX.
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Segments that are not sides of the angle include ....
OX, OZ, OQ, OY, ZX, ZQ, ZY, ZP, QY, QX, YX
