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Hurry pls. Let W denote the set of English words. for u,v are elements of W...

Hurry pls. Let W denote the set of English words. for u,v are elements of W (u~v have the same first letter and same last letter same length)

a) prove ~ is an equivalence relation

b)list all elements of the equivalence class[a]

c)list all elements of [ox]

d) list all elements of[are]

e) list all elements of [five]

find all three letter words x such that [x]has 5 elements

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