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shell state of mind

$ echo 0
0
$ echo 0 `echo 1`
0 1
$ echo 0 `echo 1 \`echo 2\``
0 1 2
$ echo 0 `echo 1 \`echo 2 \\\`echo 3\\\`\``
0 1 2 3
$ echo 0 `echo 1 \`echo 2 \\\`echo 3 \\\\\\\`echo 4\\\\\\\`\\\`\``
0 1 2 3 4 5
$ echo 0 `echo 1 \`echo 2 \\\`echo 3 \\\\\\\`echo 4 \\\\\\\\\\\\\\\`echo 5\\\\\\\\\\\\\\\`\\\\\\\`\\\`\``
0 1 2 3 4 5
$ etc.
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