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d in (-oo:+oo)
d/4 < 16 // - 16
d/4-16 < 0
1/4*d-16 < 0 // + 16
1/4*d < 16 // : 1/4
d < 16/1/4
d < 64
d in (-oo:64)
(-oo:64)
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