Answer:
The excerpt from "The Enigma Machine" that supports the claim that German soldiers accidentally helped the Allies figure out the Enigma codes is:
"Typing in messages was a boring task, so operators took shortcuts, like choosing three letters in a row or other simple, predictable patterns."
This statement suggests that the German operators of the Enigma machine were using predictable patterns when typing in messages, which made it easier for the Allies to decipher the codes.
Step-by-step explanation: