Student Profile: M. Cwi

I initially searched for a M. Cwi in the Lodz Ghetto Inhabitants database.  I then came across a few results, but only one matched that of a girl who would be born between 1926 and 1932, and that was Maryla Cwi.  I was able to find her birth date and ghetto addresses there, as well as one more piece of information.  It says ghetto note: PRZ 3.11.42 DO M 14.  I do not know what that means yet, but I am interested in knowing what it does mean.