Example
ws
Date From To Pilot Aircraft
08/28 sfo nrt mike #111
08/29 nrt sfo ann #111
09/03 sfo fra ann #222
09/04 fra sfo john #222
flight
Airline Flight_no From To
?1 ?2 sfo nrt
?3 ?4 nrt sfo
?5 ?6 sfo fra
?7 ?8 fra sfo
schedule
Airline Flight_no Date Pilot Aircraft
?1 ?2 08/28 mike #111
?3 ?4 08/29 ann #111
?5 ?6 09/03 ann #222
?7 ?8 09/04 john #222
Inverse
Rules
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