Stefa Wilczyńskas letter/answer to her and Korczaks friend - Feiga Lifshitz in kibutz Ein-Harod in Israel asking about "sign of life" from dr. Korczak (Februari 15th, 1940) through IRC.
She wrote that they are healthy and that she works and that Korczaks works "a lot" and she could not travel (to Israel) without children.
Stefa could just write one word in Yiddish "gvald" that means 'emergency'. cognate with German Gewalt "force, violence" or Polish "gwałt". She used, however, 22 of allowed 25 words to answer.