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If the lines $x = ay + b$, $z = cy + d$ and $x = a’z + b’$, $y = c’z + d’$ are perpendicular, then:
(1) $ab’ + bc’ + 1 = 0$
(2) $cc’ + a + a’ = 0$
(3) $bb’ + cc’ + 1 = 0$
(4) $aa’ + c + c’ = 0$
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