Determine the domain and range of the function f : {r, s, t , u} {A,B,C,D,E}

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Determine the domain and range of the function
f : {r, s, t , u} → {A,B,C,D,E}
defined by f (r) = A, f (s) = B, f (t) = B, f (u) = E.
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