Two pairs of cluster of letters creates word
Clean and group.
Start file
't', 'wo', 'pa','irs', 'o', 'f','clus','ter', 'o', 'f', 'lett', 'ers', 'crea', 'tes', 'wor','d'
End file
two pairs of cluster of letters creates word
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1c1,8 < 't', 'wo', 'pa','irs', 'o', 'f','clus','ter', 'o', 'f', 'lett', 'ers', 'crea', 'tes', 'wor','d' --- > two > pairs > of > cluster > of > letters > creates > word
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