Let W(x, y) mean that student x has visited website y, where the domain for x consists of all students in your school and the domain for y consists of all websites. Express each of these statements by a simple English sentence.
a) W(Sarah Smith, www.att.com)
b) ∃xW(x, www.imdb.org)
c) ∃yW(José Orez, y)
d) ∃y(W(Ashok Puri, y) ∧W(Cindy Yoon, y))
e) ∃y∀z(y ≠ (David Belcher) ∧ (W(David Belcher, z) → W(y,z)))
f) ∃x∃y∀z((x = y) ∧ (W(x, z) ↔ W(y, z)))