Question: Explain what the following sed command does. Note that there is a space before and a space after [0-9]+. sed 's/[a-z+[09]+[a-z]+/&1&3/'

Explain what the following sed command does. Note that there is a space before and a space after [0-9]+.

sed 's/[a-z+[09]+[a-z]+/&1&3/'

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