The word Tesellate is misspelled against Tessellate, an adjective meaning "Tessellated."
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Tessellate has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings te & ellate which should not be misspelled with single 'S'
Wrong Spelling:  te-s-ellate 
Correct Spelling:  te-ss-ellate 
Explore spell check of Tessellate to spell without errors.