Wasn't Nicki's Save Me also supposed to be a single, or at least get a video? Same with Champion.
Other than that, 2NE1 was supposed to release 4 singles, 1 for every month, before they dropped their album. They only released two singles, went on a hiatus, came back a few months later with a third single, went into hiding again and then released a full all-new-songs-album without any of the earlier released singles included in February.
I assume the other single of those 4 would have been 'Happy'.
It wasn't even given the proper single treatment when it was released either 
