Question: Professors Skelton and Baron are concerned that at the start of case 1 of RB-DELETE-FIXUP, the node x.p might not be black. If the professors

Professors Skelton and Baron are concerned that at the start of case 1 of RB-DELETE-FIXUP, the node x.p might not be black. If the professors are correct, then lines 5-6 are wrong. Show that x.p must be black at the start of case 1, so that the professors have nothing to worry about.

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