List all strings over X = {0,1} of length 2 or less.

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The empty string $\varepsilon$ is a binary string of length 0.

and $1$ are binary strings of length 1.

$00, 01, 10, 11$ are binary strings of length 2.

$\varepsilon,0,1,00,01,10,11$

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Question ID: mtid-5-stid-8-sqid-861-qpid-746