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In page Lincos language:

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The Lincos "dictionary" is intended to be transmitted first before any additional messages. It teaches natural numbers by a series of repeated pulses, separated by pauses. It then teaches >, <, =, +, -, by examples such as . . . . . > . . . (an extended pause is shown around > in this example so as to suggest to an alien that > is a new separate symbol; otherwise, an alien might think that the whole pattern is a new symbol of unknown meaning). In introducing =, unary notation is shown for numbers: . = 1, . . = 2, and so on. This progresses to multiplication, division, variables, and constants, then propositional logic, set theory, and first-order logic. The dictionary tries to introduce questions by leaving mathematical expressions unsolved (e.g., ? x x + 101 = 11).[citation needed]