Hello, I have a data set of flows between locations, locations without flows are omitted, however, I need to use the complete set of combinations in my procedure, with 0 value for observations without flows. which is the best way to generate the full collection of combinations. Thank you, Data Have Data Want From To Count From To Count City A City A 10 City A City A 10 City A City C 15 City A City B 0 City A City D 7 City A City C 15 City B City B 22 City A City D 7 City B City D 13 City B City A 0 City C City A 35 City B City B 22 City C City B 3 City B City C 0 City C City C 4 City B City D 13 City C City D 18 City C City A 35 City D City C 25 City C City B 3 City C City C 4 City C City D 18 City D City A 0 City D City B 0 City D City C 25 City D City D 0
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