Collection #1:
Can't be divided.

Collection #2:
Can be divided.

Collection #3:
Can't be divided.

Collection #4:
Can't be divided.

Collection #5:
Can't be divided.

Collection #6:
Can't be divided.

Collection #7:
Can't be divided.

Collection #8:
Can't be divided.

Collection #9:
Can't be divided.

Collection #10:
Can't be divided.

Collection #11:
Can't be divided.

Collection #12:
Can't be divided.

Collection #13:
Can't be divided.

Collection #14:
Can be divided.

Collection #15:
Can be divided.

Collection #16:
Can be divided.

Collection #17:
Can be divided.

Collection #18:
Can be divided.

Collection #19:
Can be divided.

Collection #20:
Can be divided.

Collection #21:
Can be divided.

Collection #22:
Can be divided.

Collection #23:
Can be divided.

Collection #24:
Can be divided.

Collection #25:
Can be divided.

Collection #26:
Can be divided.