This person is an extra player to play in the front row position. This player can only come on if all of the other front row players have been used and an injury occurs. The reason the 23rd man has been introduced is to prevent uncontested scrums, which occur when when too many front row player get injured as it is a very specialized position and if an unexperienced player had to play that position without proper training it could be very dangerous for the other front row players.
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