5m Zen
X y z p q r
X y z p q r pictures 5
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X y z p q
X y z p q r
a b )( p q r )( x y z
x1 / p u003d y1 / q u003d z1 / r
is x u003d y u003d z u003d p u003d q u003d r analysis
x y z p q r
