QL-4: List of perpendicular QL-Lines

In next list all QL-points are mentioned without prefix “QL-”.
All lines relating to QL-P1 till QL-P26 have been taken into account.
When lines have more than 2 points, they are defined by the 2 points with lowest serial number.
These QL-lines are perpendicular:
        P1.P7   _|_  P18.P23
        P1.P8   _|_  P16.P24
        P1.P25 _|_  P16.P17
        P2.P3   _|_  P2.P7
        P2.P7   _|_  P5.P7
        P2.P10 _|_  P18.P23
        P6.P9   _|_  P13.P17


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