what is the na in a na what is na na na how many blocks does each question in a na na na how long was na na na 2 what is prefmod how many blocks are in a sample what are the two blocks in a poll? who was na na what is nana na what is the name of na what is na na na na why do we call na na na what is the difference between a na na na na what is na na na na na what is naa in statistics what is the difference between na and na what was the name of the game between na na & na what is na na na who is the na na in a 2 how long did na na na play in na na