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Which of the following does not act as a Lewis acid?
Manual Signals
Hand signals or gestures used to communicate messages, often in situations where verbal communication is not possible or practical.
Vocal Speech
The production of sounds or utterances using the vocal tract, including the lips, tongue, throat, and lungs, for the purpose of communication.
Brain Locus
A specific location or site in the brain where certain processes or activities are carried out.
Second Languages
a term referring to any language learned in addition to a person's first language.
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