Question: 11. Append a fourth check digit to each seven-digit code created by the Venn diagram method c4 = al + a2 + a3 + 34.

11. Append a fourth check digit to each seven-digit code created by the Venn diagram method c4 = al + a2 + a3 + 34. With this additional check digit, can double errors be detected and/or corrected
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