Assuming "z" is not found earlier in the proof, from (?x)(?y)((Px • Py) ? Lxy) we may validly infer
A. (?x)((Px • Pb) ? Lxb).
B. (?y)((Pa • Py) ? Lay).
C. (?y)((Py • Py) ? Lyy).
D. (?x)((Pa • Py) ? Lay).
B. (?y)((Pa • Py) ? Lay).
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