We currently use provides parameter to determine auxiliary steps, so

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output: 'a.txt'

would not work for command sos run -t a.txt because although the step generates a.txt, it does not provides this outcome. I am wondering if we can extend SoS to allow implicit provides for steps with very clear output (no pattern matching, no derived output from input etc). This might make SoS easier to use, but might also confuse users.