Task 3 is the rub your bulge, yeah? Press C. You need to do each task 4 times for the game to be happy (at least that's what I counted).
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You can change keybinds in the settings by clicking each sign and inputting your own. I made sure it should work for most symbols, even stuff like mouse 4/5. You can also do that midgame now after pressing ESC. If all that fails, there's also a keybinds.jcons in game files and you can edit it manually. All settings files are human readable just in case!