Logic Masters Deutschland e.V.

This one feels a little too easy but I don't want all the time I spent on it going to waste.

AB Series:
ABABA
ABBA
BBABB
AB Squared
Triangular Letters
Now I Know My ABCs

Rules:
Place 5 As and 4 Bs in every row, column, and 3x3 region.
A appears one time at most on the orange line.
Every 2x2 cage has the same pattern of As and Bs (i.e. if the top left letter of one cage is an A, the top left letter of all 2x2 cages are A).
Cages may overlap (but they don't).
All cages of the given type are given; the pattern that appears in the given cages appear only in the given cages.