Get all pairs of city values such that a supplier in the first city supplies the specified part to a project in the second city.

: Table SPJ : Table | Slam e l Status | City S1 Smith S2 Jones S3 Blake S4 Clark S Adams 20 London IISI PI?J1 20 10 Paris 1 P1 4 00 20 London s2 P3 2 0 Status City ?1-30 Athens P:Table | | P# | PName | Color | Weight | City -sz N |J SPJ P1 Nut Red P# P3 Screw Blue P ScrewRed P5 Cam Blue P6 Cog Red 19 London 12 Paris $A P63 30 ] : Table J#?JName | City J2 Punch Rome 3 Reader Athens S5 |P5 1,7 l 100 35 PI IJA 100 S5?P3 IJA 11200 P5 J400 J1 Sorter Paris 2 +J Name City +J4 Console Athens 5 Collator London J6 Terminal Oslo