JCF Punch Combination 2 is a Jab with your left hand, followed by a cross with your right. (1, 2)
JCF Punch Combination 3 is a Jab with the left hand, followed by a cross with your right, and ends with a left hook. (1, 2, 3)
JCF Punch Combination 4 if a left jab, right cross, left hook, and right uppercut. (1, 2, 3, 6)