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If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

If you mean single Roman letters, they can either stand for numbers or abbreviations.

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14y ago

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