Tb   =  Tb separator, no quotes
Tab  =  Tb separator, no quotes

QTb  =  always Quoted, TaB separator

TbQ  =  TaB separator, Quoted only if needed

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Sep  =  Many separators possible, no Quotes

Q__  =  always Quoted, many separators possible
Q_   =  always Quoted, many separators possible

__Q  =  Many separators possible, Quoted only if needed
_Q   =  Many separators possible, Quoted only if needed
