Sometimes you want to keep both alternatives for a particular difference. To do this, use x c, which edits the merge buffer like this:
#ifdef NEW version from A buffer #else /* NEW */ version from B buffer #endif /* NEW */
While this example shows C preprocessor conditionals delimiting the two alternative versions, you can specify the strings to use by setting the variable emerge-combine-versions-template to a string of your choice. In the string, `%a' says where to put version A, and `%b' says where to put version B. The default setting, which produces the results shown above, looks like this:
"#ifdef NEW\n%a#else /* NEW */\n%b#endif /* NEW */\n"