Question: How many regular seasons did the National Hokey League have up til the 1991-92 Edmonton Oilers season?
Sentence (from "1991–92 Edmonton Oilers season"): The 1991–92 Edmonton Oilers season was the Oilers' 13th season in the NHL, and they were coming off a 3rd round playoff appearance in 1990–91, losing to the Minnesota North Stars in the Campbell Conference finals.
Relevant evidence: Yes