| http://www.w3.org/ns/prov#value | - So, by converting the means required for solving the problem, i.e. the stimuli signs or words into a variable quantity, and making the problem into a constant quantity, we are able to investigate how the experimental subject uses these signs as means to guide his intellectual operations, and how, depending on the way that these words are used, the process of concept formation as a whole emerges an
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