**This is an old revision of the document!**
knee - leg = elbow - arm
knee is to leg as elbow is to arm
knee : leg :: elbow : arm
Rome - Italy = Beijing - China, so Rome - Italy + China = Beijing
king : queen :: man : woman
house : roof :: castle : [dome, bell_tower, spire, crenellations, turrets]
China : Taiwan :: Russia : [Ukraine, Moscow, Moldova, Armenia]