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$_ is a special variable whose value is always equal to the result of the last operation in the console.
Text in image:
Machine generated alternative text:
>
>
2+2
4
4
2+2+1
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$_ is a special variable whose value is always equal to the result of the last operation in the console.
Text in image:
Machine generated alternative text:
>
>
2+2
4
4
2+2+1