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| Chapter 13 mm Macros |

## 13.4 Other Reserved Macro and String Names

In `mm`, the only macro and string names you can safely use are names consisting of a single lowercase letter, or two character names whose first character is a lowercase letter and whose second character is `anything but` a lowercase letter. Of these, only c2 and nP are already used.

13.3 Number Registers Used in mm |  | 14. ms Macros