[NoboruWataya]

Yes, 1 August and 4 August have me stumped. Interestingly it says I have discovered 100% of words on 1 August, but I wasn't able to whittle it down to 0. I'm not sure if that just means I missed an opportunity to remove the space somewhere.

[IanCal]

August 1st can be done with

https://gist.github.com/IanCal/f3deffd5961a2cc2860094a4d68ed...

[littlekey]

Or maybe it depends on the order in which you remove the letters? Just a guess.

[ipsento606]

August 4 is not solvable with the given wordlist. There is no way to get to a word below 3 letters ("set")