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Palindrome Skyscrapers: P1

This puzzle type I created for "Contest for best logic innovation"

Fill the grid with numbers from 1 to 3 (representing the heights of buildings) so that each row and column contains each digit exactly twice. Digits outside the grid show the number of buildings visible from their positions (shorter buildings are hidden behind the taller ones). In each row and each column digits form the palindrome string i.e. the string will be same while reading forward or backward e.g. 132231 is palindrome string. Empty squares (if any) are not considered part of string.

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