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What do ee and er mean in circles?

Two people who scratch others in English (er for short) and one person who is scratched (ee for short).

TK's full name is tickle, which means tickle, tickle. Adding appropriate objects can be extended to scratch the soles of feet and other similar aspects. TK belongs to the letter circle, that is, the tickling game, and this game needs at least two people, one is the tickler (er for short) and the other is the tickler (ee for short), but the number of people is not capped.

Because the scratched person will struggle with conditioned reflex in the process of scratching, in order to get a more exciting process experience, most people will discuss with the people who play together and choose to bind the scratched person to different degrees.