Write the following list of characters into a correctly formed sentence: ThepapercontainsthreeletterswrittenbyValléePoussintoLuzindated4February1933,8March1933and21March1933.ValléePoussincommentsintheselettersonthefact,whichisofgreatinteresttohim,thatLuzinusedslightlydifferentclassificationsofthesamesetsashehadstudied.
The paper contains three letters written by Vallée Poussin to Luzin dated 4 February 1933, 8 March 1933 and 21 March 1933. Vallée Poussin comments in these letters on the fact, which is of great interest to him, that Luzin used slightly different classifications of the same sets as he had studied.