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You can put this solution on YOUR website!
\r\n" );
document.write( "There are 2^4 or 16 of them since there are 4 elements.\r\n" );
document.write( "\r\n" );
document.write( "{} The empty set, has 0 elements\r\n" );
document.write( "{11}\r\n" );
document.write( "{12} These 4 have just 1 element, they are called \"singletons\"\r\n" );
document.write( "{13}\r\n" );
document.write( "(14)\r\n" );
document.write( "{11,12}\r\n" );
document.write( "{11,13}\r\n" );
document.write( "{11,14} These 6 have 2 elements\r\n" );
document.write( "{12,13}\r\n" );
document.write( "{12,14}\r\n" );
document.write( "{13,14}\r\n" );
document.write( "{11,12,13}\r\n" );
document.write( "{11,12,14} These 4 have 3 elements\r\n" );
document.write( "{11,13,14}\r\n" );
document.write( "{12,13,14}\r\n" );
document.write( "{11,12,13,14} This 1 has all four elements. It is not considered a\r\n" );
document.write( " PROPER subset, since it is the WHOLE, not really deserving\r\n" );
document.write( " of the prefix \"sub\" but it is considered a subset anyway.\r\n" );
document.write( "\r\n" );
document.write( "Edwin \n" );
document.write( "