The 'else' keyword is probably a literal translation from German (2020)

Automated excerpt

There is nothing like "else" in this formulation of "if." However, Algol 58 also had a second conditional form, called "if either." with "else if." But there is nothing equivalent to "else" by itself, were presented at a conference. "ifs" inside its block behave like "else ifs." It is not clear whether idea that had already been rejected in favor of "if either." Either way, "if either" would soon be replaced. The MAD programming language also went its own way.

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