Something I never understood. During years 1,2,4,5 one takes of maaser sheni and had to eat it in Jerusalem. This, as well as Neta Revai, helps a family to support a person to stay in Jerusalem and learn. OK, so far so good.
In years 3 and 6, one takes off Maaser Ani for the poor. What do the poor eat during the other years? I know that there is Shichcha, Leket, and Peah that helps. But if the 3 are enough what is maaser sheni needed for, and if 3 are not sufficient, then what do the poor do in years 1,2,4,5?