In trying to understand Kenji Miyazawa's "風の又三郎" I have come across a discrepancy in one line where the number of students per class is counted.
On Aozora Bunko: I see this:
At first I thought this was a bit odd because of the part "一二年生は", but when I interpreted this to mean "1st or 2nd graders", the total 12 matches up with the numbers in the second line above (8+4).
However, in this relatively recent analysis of the work (starting around 13:20 in the video), the line is actually read as "三年生は", and this is specifically pointed out as a (possibly purposeful) mistake because it conflicts with the early part of the story that says there are no third graders.
I assume one of them is a typo or someone mis-reading a hand-written manuscript, but I don't know what the "real" original text was. Supposedly the author did many revisions so it isn't likely there would be accidental errors in his work.
Can someone please tell me if they know what the correct line is here? If you don't know anything about the story, if you can tell me if the line I quoted above looks correct, or if it is strange to write "一二年生は". I have seen that usage commonly (ex: ”彼は１１,１２歳" and I am not sure if that is the intention here).