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Question

In the following list of numerals, how many 2's are followed by 1's but not preceded by 4 ?
4 2 1 2 1 4 2 1 1 2 4 4 4 1 2 2 1 2 1 4 4 2 1 4 2 1 2 1 2 4 1 4 2 1 2 4 1 4 6

A
Two
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B
Three
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C
Four
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D
Five
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