instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Pelycosaurs are a paraphyletic group of _ primitive families of synapsids.
answer:
six


question:
Most women have _ problems getting pregnant with a retroverted uterus.
answer:
no


question:
Rules Go is a game for _ players.
answer:

two