"once you learn to ride a bicycle, you never forget" pertains to memory.

Procedural Memory

Explanation:

Procedural memory is a part of the long-term memory that is responsible for knowing how to do things, also known as motor skills.

As the name implies, procedural memory stores information on how to preform certain procedures, such as walking, talking and riding a bike.

Explanation:

AB testing is essentially an experiment where two or more variants of a page are shown to users at random, and statistical analysis is used to determine which variation performs better for a given conversion goal.

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