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In Pico, syntax is kept to a strict minimum. Actually, in addition to the syntax of numbers, fractions and text, only 3x3 = 9 rules need to be memorised in order to master Pico's essential syntax:
This table lists the possible invocations -references, applications and indexations- from left to right; from top to bottom is listed how these invocations can be used inside an expression. Each of the nine combinations has a unique label that will be used throughout the rest of this text.
We shall now proceed by describing the
meaning of these grammatical rules in an informal way.