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Set construction with condition

• To: mathgroup at smc.vnet.net
• Subject: [mg61470] Set construction with condition
• From: "Edson Ferreira" <edsferr at uol.com.br>
• Date: Wed, 19 Oct 2005 23:07:19 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Dear Mathematica experts,

I have this definition of L which generates a list of 81 elements:

L=Flatten[Outer[StringJoin,{"1","X","2"},{"1","X","2"},{"1","X","2"},{"1","X","2"}]]

How can I modify this definition in order to generate only elements in which there are a maximum of 2 characters "1"?

Thanks!!!!!!!!!!!!!!

PS.: I don't want to filter the entire 81 elements set AFTER the generation. I want to generate it with the desired elements.

• Follow-Ups:
  • Re: Set construction with condition
    • From: János <janos.lobb@yale.edu>