Text: This could have been a dream end of a success story of a modest guy calling himself Boss, if not for one, accidental copypaste, which was a side effect of a routine practice that had the right to become visible after four years of very intensive and marked with great accomplishments work from the bottom up.
Entailment: It could have ended differently for the man who called himself Boss, if only the one accidental copypaste didn't occur.
Contradiction: There is no way this could have ended better for the Boss and he was thrilled that nothing went wrong.