Let A be the set of all strings of 0's, l's, and 2's of length 4. Define a relation R on A as follows: For all s, t e A, the sum of the characters in s equals s Rt the sum of the characters in t. a. Is 0121 R 2200? c. Is 2212 R 2121? b. Is 1011 R 2101? d. Is 1220 R 2111?

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