Let E: Z32 Z92 be the encoding function for the (9, 3) triple repetition code. (a)

Question:

Let E: Z32 → Z92 be the encoding function for the (9, 3) triple repetition code.
(a) If D: Z92 → Z32 is the corresponding decoding function, apply D to decode the received words
(i) 111101100;
(ii) 000100011;
(iii) 010011111.
(b) Find three different received words r for which D(r) = 000.
(c) For each w ∈ Z32, what is | D-1(w) |?