ove to peg C
G3/4	disk 3 moves to peg C on disk 4
G1/2	disks 1 and 2 move to peg C on disks 3 and 4.

- Batches of manipulations
B4	sequence of manipulations ending by move of  disk 4
B3	sequence of manipulations ending by move of  disk 3 before disk 4 can be
moved
B3'	sequence of manipulations ending by move of  disk 3 after disk 4 has
been moved one time
B3/4	sequence of manipulations ending by move of  disk3 onto disk 4
B1/2	sequence of manipulations moving disks 1 and  2 onto disks 3 and 4

These three 