I believe that if one of the on-field umpires is unwell or injured, the third umpire will take his place and the fourth umpire will act as the TV umpire. What happens if both on-field umpires cannot take the field. Does the third and fourth umpires take over? Who adjudicates decisions referred to the third umpire? The match referee? Lastly, what happens if three out of 4, or all 4 umpires are unable to perform, or choose to boycott the game for some reason. Is the game called off/suspended, or are replacement umpires brought in?
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