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++-----------------------------------------------------------------------------+
+| extension |
++-----------------------------------------------------------------------------+
+
+Abbreviation: ã|\exã%
+
+Parameters: ã|noneã%
+
+ ã|Description:ã%
+The \extension markup sets the face to the Computer Modern Math Extension
+face. Refer to The TEXbook, Appendix F, for a complete list of the
+characters available in the Extension face.
+
+ ã|Example:ã%
+This example uses \extension to print an "O dot":
+
+Put a {\extension\char'113} next to . . .
++-----------------------------------------------------------------------------+
+| |
+| Put a K next to . . . |
+| |
+| |
++-----------------------------------------------------------------------------+
+
+ ã|Notes:ã%
+For more on the use of the \char markup, refer to The TEXbook.