Boost Preprocessor - Nested repeat?

I have what looks like a perfect application for Boost/Preprocessor. I have 192 entries in a Factory Map a portion of which are show below. I'd like to generate the permutations of the three macro inputs, but can't figure out where to start. Any help would be appreciated. #define MAP_ENTRY_MCR( aLang, aType, aAcc ) \ \ mMap[ CKey( aLang, aType, aAcc ) ] \ = CVarX< aLang, aType, aAcc >::Make; MAP_ENTRY_MCR( DCTlanguageC, DCT_DOUBLE , DCT_NONE ); MAP_ENTRY_MCR( DCTlanguageC, DCT_DOUBLE , DCT_INIT ); MAP_ENTRY_MCR( DCTlanguageC, DCT_DOUBLE , DCT_ANYTIME ); MAP_ENTRY_MCR( DCTlanguageC, DCT_FLOAT , DCT_NONE ); ... Thanks, Jeff Flinn