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Sulphur has {{U}}occasionally{{/U}} been found in the earth in an almost pure state.

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regularly  accidentally sometimes  successfully  
physical deformation  state exchange  chemical reaction  coalescence  
sulphur; walnut; urea  sulphur; urea; walnut  urea; sulphur; walnut  walnut; urea; sulphur  
high flash point and high viscosity  low flash point and high viscosity  low heating value and high sulphur content  high heating value and low sulphur content  
regularly  accidentally  sometimes  successfully  
fuel dribbling from leaking fuel injectors  burning fuel with a high carbon content  burning fuel with a high vanadium content  burning fuel with a lower sulphur content  
Gasoline  Water  Lubricating oil  sulphur compounds  
CO2  Methyl chloride  R-22  Sulphur dioxide  
despite  with  without  for  
High sulphur content fuel  High lube oil temperatures  High vanadium content fuel  Excessive piston slap  
sulphur;walnut;urea  sulphur;urea;walnut  C. urea;sulphur;Walnut  walnut;urea;sulphur  
regularly  accidentally  sometimes  successfully  
Injection lag  Lube oil dilution  Pre-ignition  Corrosion  

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