When I opened problem set and sorted it , It showed me palindromic twist is the first!!↵
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<img src="https://www.imageupload.co.uk/images/2018/09/09/92.png" border="0">↵
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**Update** : It's solved now
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<img src="https://www.imageupload.co.uk/images/2018/09/09/92.png" border="0">↵
↵
**Update** : It's solved now