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Identify UCS, UCR, CS and CR: Each time you take your dog Jake on a walk, you call "Jake, time for a walk!" and when he comes, you take him for a walk. As of recently, you've started to jingle his leash right before you call him. Now whenever you jingle his leash, he knows it's time for a walk.
(assume Jake knows his name very well and knows what the words "time for a walk" signifies)
UCS: "time for a walk!"
UCR: Jake comes to you (when you call him)
CS: jingle of the leash
CR: Jake comes to you