Speculations
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A broken rail caused the rail crash (must)
A broken rail must have caused the rail crash
The houses didn't collapse in the earthquake because of a design error. (can't)
The houses can't have collapsed in the earthquake because of a design error.
The flight crew fell asleep due to cabin depressurisation and lack of oxygen. (fallen)
The flight crew must have fallen asleep due to cabin depressurisation and lack of oxygen.
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