Please reason step by step, and put your final answer within \boxed{}.
A soccer team had 24 players prepared for a soccer game. The first half saw 11 players start the game with 2 substitutions made. In the second half, the team made a certain number of substitutions. 7 players on the team did not play that day. What is the ratio of the number of substitutions made in the second half to the number of substitutions made in the first half?
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