[dawlthy]

I think I've solved the ouehra bit. Well partly at least.

It's the second letters of the days of the week, like this

mOnday
tUesday
wEdnesday
tHursday
fRiday
sAturday

In this case the question mark at the end is in place of another U, for sUnday

Also my phone really isn't happy typing days of the week without a capital letter at the start, that took way longer to type than it should

Edit: just realised this doesn't explain the e=5 bit, Wednesday isn't the 5th day of the week? But days are another thing that there are 7 of. We now have a 7x7 grid, the numbers without 1, 5 and 7 (leaving just 7numbers in the 1-9 range) and 7 days. We also have 3 strings of 49 letters which is 7 x 7, so I think the 4th string might be missing a letter.

I think there must be some way of assigning numbers to the other days of the week