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We have made an informal introduction of the language Pico. We have covered the various values -number, fraction, text, function and table- and the various grammatical constructs -references, applications, indexations- and their definition or assignment.
This gives us a sufficient picture of
Pico so as to use it as meta-level language for the specification of
a machine to interpret base-level programs also written in Pico. This
will be the subject of the next chapter.