task	task time (seconds)	tasks that must precede
A	50	--
B	20	A
C	40	--
D	45	B
E	20	B
F	25	D
G	10	C,E,F

The above tasks must be performed on an assembly line in the sequence and times specified. The workstation cycle time is 72 seconds. Using the longest task time to balance the assembly line, the first workstation include _______, the second workstation include ________, and the third workstation include _________. (For each blank write tasks in alphabetical order without space or comma. For example, if workstation 1 includes task A, task C and task E, write them as ACE, not A,C,E, A C E or CAE.)