MODEL:
SETS:
  SONG/1..7/: LENGTH, Y;
ENDSETS
  ! Maximize number of songs on short side;
   MAX = @SUM( SONG: Y);
  ! It must contain at most half the music;
   @SUM( SONG: LENGTH * Y) <= HALF;
  ! Compute half the length;
   HALF = @SUM( SONG: LENGTH)/ 2;
  ! We want the Y's to be 0/1;
   @FOR( SONG: @BIN( Y));
 DATA:
   LENGTH = 7, 5, 2, 2, 2, 2, 2;
 ENDDATA
END