We did not need 44 recipes for B...

We are the knights who say... N=I+I+I

Operations (sum and difference) are combining a plus (+) or a minus (-) to two numbers (as well as the additional recipe for sum that does NOT include a sign, which allows up to three and four numbers to be added). Not the hash symbol! Crucially for the difference recipe, the numbers must be DIFFERENT numbers, which is a very weird distinction (and obviously, they must not add above 9 or subtract below 0, as a factory can only generate one output and does not (sadly) count in base 36).

% has an additional recipe, that is
0 + 0 + -
but this recipe is glitched. The game acts as if you already have this recipe even if you've never made it before, and it never shows up in your recipe book. Very strange!

If 3 recipe guides weren't bad enough...

However, two are from an older version (with one of those unfortunately missing most of the screenshots) and the other one is incomplete (and I found way too many on my own to simply just comment my findings there!). So I took what recipes I could from the three guides, as well as from the comment sections of those guides (and this guide. huge thanks to, jovpet1! and thanks ElderAxe for managing to find a couple more after all this time!), and completed it with my own discoveries!

I've tried many different combinations and orientations (I even experimented with question marks, fruitlessly), but obviously I haven't brute-forced EVERY combination, so there's probably more left to be discovered (hopefully no more B's or H's). Do let me know if there's any that I missed (that are from the updated game, as recipes have changed in previous versions).

END GOALS:

• Find ALL the recipes (we might've done it? thanks Wrothmonk for checking!)
  
• Contemplate the letter B
  
• Argue with the dev that v+^+- makes *, and that bending a question mark should result in an exclamation point, and that if I+)+) makes sense for B, then why doesn't I+I+)+) like the flipped C and sideways U work with, and why does no other orientation of 4 + I make an H too, and that rotating, flipping, and bending a G totally makes sense for either @ or Q, and why does sideways flipped bent S turn into ~ but sideways flipped bent ~ doesn't result in S
  
• Eat more bowls of chicken noodle soup
  
• Add more to the end goals list. Hopefully in chicken noodle soup form. Maybe alphabet soup?