The states have increased the number of products that they work together to purchase: envelopes, soft paper products, motor oil, retread tires, traffic cones, and computer forms.
(The states; have increased; the number of products) (they; work together; to purchase) Context(they work together,List([54, 72))):(they; work together to purchase to purchase; )
they work together,List([54, 72))
The states they they
have increased work together work together to purchase to purchase
the number of products
to purchase