In an innovative contest four kinds of fruit,apple, banana, chikoo and dates, are placed in four different boxes. The boxes are closed and not transparent. Participants are asked to guess correctly the contents of each box. In all 123 students participate. 43 of them could not identify any of the boxes correctly. 39 of them could guess one box correctly. However, as many as 31 could guess two correctly but were wrong in identifying the other two. Can you tell how many people identified three boxes correctly and how many identified all four?
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