With the AFL – NFL merger of 1970 , the newly merged NFL was granted a Sherman Anti-Trust Act exemption , which emboldened some team owners to expand the exhibition schedule and to require season-ticket holders to pay for one , then two , then three home exhibition games if they wanted to keep their season tickets .
ADP DET PROPN – PROPN NOUN ADP NUM , DET ADV VERB PROPN AUX VERB DET PROPN PROPN PROPN NOUN , DET VERB DET NOUN NOUN PART VERB DET NOUN NOUN CCONJ PART VERB ADJ NOUN PART VERB ADP NUM , ADV NUM , ADV NUM NOUN NOUN NOUN SCONJ PRON VERB PART VERB PRON NOUN NOUN .