The word Symetric is misspelled against Symmetric, an adjective meaning "Symmetrical."
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Symmetric has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings sy & etric which should not be misspelled with single 'M'
Wrong Spelling:  sy-m-etric 
Correct Spelling:  sy-mm-etric 
Find more wrongly spelled words of Symmetric to spell it well.