Grid zones within MGRS are further divided into 100,000-meter squares that are identified by the combination of two letters. The first letter is the what designation and the second letter is the what designation? What is this combination of letters known as.

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1. Grid zones within MGRS are further divided into 100,000-meter squares that are identified by the combination of two letters. The first letter is the what designation and the second letter is the what designation? What is this combination of letters known as.