a	(d2,1)
and	(d1,1)
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copyleft	(d2,1)	(d3,2)
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freedom	(d2,1)
is	(d1,1)
licenses	(d5,5)
program	(d1,2)
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share	(d3,2)
software	(d4,1)	(d5,1)
the	(d1,1)
users	(d3,1)
works	(d4,1)