No limit Texas Holdem, 100/200, 4 players, preflop
player 1 stack - 600, player 2 stack - 700, player 3 stack - 5000, player 4 stack - 3500
First player goes all in for 600 chips
Second player goes all in for 700 chips
Third player calls
Fourth player calls
Should players 1 and 2 show their cards (as there are no actions available for them) or the next betting round will go with all the player cards facing down the table?