Tesellating or Tessellating: How To spell?
The word Tesellating is misspelled against Tessellating, which is present continuous of "Tessellate"
Tessellating has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings te & ellating which should not be misspelled with single 'S'
Wrong Spelling:  te-s-ellating  Correct Spelling:  te-ss-ellating 
Find more wrongly spelled words of Tessellating to spell it well.