Why are there 2 versions of BLUE BIRD?

[Tasked]

yup.. marketing tactics because it was her 40th single...
BLUE BIRD was initially scheduled as a 3A-single. It would have been a continuation of "A", "H" and "&", according to Ayu's official website. But they removed one song and made it a 2A-single..
So this was the extra marketing tactic to make up for it. Plus if you bought all 3 versions you'd get a free poster =) Which people like me did, so it worked