id	keyword
ejpam-4082	snow
ejpam-4082	problem
ejpam-4082	time
ejpam-4082	l ≤
ejpam-4082	transportation
ejpam-4082	removal
ejpam-4082	xijl
ejpam-4082	cost
ejpam-4082	jit
ejpam-4082	truck
ejpam-4082	flow