Theory

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Find out how much you can do using just one string method: replace().

Match the items from left and right columns
'robot'.replace('o', '_', n)
"".replace("", 'robot')
'robot'.replace('o', "")
'robot'.replace("", " ")
Inserts a substring into the empty line.
Removes substrings from the line.
Replaces n first occurrences of an old substring with a new one.
Adds spacing between letters.
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