Please draw decision tree based off the data

Express Inc. Manufacturing produces high-end aircraft parts. Their Landing Gear Shop has four machines to make precision airfoil parts: a metal lathe, a turning machine, a milling machine, and a radial drill. This shop has six machine machinists, most of them are certified to work on all the machines and have demonstrated that they perform better on some machines than on others. The Landing Gear has been tasked with a big job that requires all four machines. The times required by the machinists to perform the required work on each machine is given in the table below.

Machinist	Operating Time (minutes)
	Metal lathe	Turning machine	Milling machine	Radial drill
1	34	16	51	21
2	56	37	32	43
3	27		65	52
4	36	22	53	25
5	45	39	57	31
6	28	32	49	36

Note that Machinist 3 has not yet been certified on the turning machine. As a result, the shop manager will not assign this machinist to that machine.

I need help drawing a decision tree based off the data!!! Please help