The figure shows the displacement y of a wave at a given position as a function of time and the displacement of the same wave at a given time as a function of position. Determine the frequency of the wave. 
Definitions:
High-similarity Group
A group of individuals or entities that share a high degree of common traits, interests, or characteristics.
Low-similarity Group
A group composed of individuals who have diverse attributes, backgrounds, or characteristics, leading to low levels of similarity among its members.
Egoistic Helping
Acts of assistance motivated by a desire to benefit oneself, such as feeling good or avoiding guilt.
Reciprocity
The social norm of responding to a positive action with another positive action, rewarding kind actions.
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