permutation noun
Meaning:
: often major or fundamental change (as in character or condition) based primarily on rearrangement of existent elements
Example:
Before finalizing it, the system has gone through several permutations
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Clean as a Hound’s Tooth
Meaning:
very clean, highly polished, etc.; innocent and honest.
Example:
The candidate had made a name for himself by accusing other politicians of corruption. Therefore, his running mate had to be as clean as a hound’s tooth.
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