All-Star Trivia: What Do These Player Pairs Have In Common?

Answer:  These pairs of players have:

1.  Played in two All-Star Games.

2.  Played in those games at least four years apart.

3.  The pairs have played in their first ASG together and their second one also. 
e.g., John Olerud and John Burkett played in their first ASG and their second together, 1993 and 2001.

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