{HEAD ~ The process} 1 wherein said hydrocarbons are acetylene, ethylene, propylene, propane, n butane, {TAIL ~ iso butane}, the n butylene isomers and the various iso butylene isomers 
{ HEAD ~ The process } 1 wherein said hydrocarbons are acetylene , ethylene , propylene , propane , n butane , { TAIL ~ iso butane } , the n butylene isomers and the various iso butylene isomers
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