Question: Given a string s, return a string made of the first 2 and the last 2 chars of the original string. So 'spring' yields 'spng'.

Given a string s, return a string made of the first 2 and the last 2 chars of the original string. So 'spring' yields 'spng'. However, if the string length is less than 2, return instead the empty string.

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