preparing a reaction mixture comprising sources of alumina, phosphorus, and, optionally, silica and further comprising at least one first organic directing agent for directing {HEAD ~ the synthesis} of {TAIL ~ an AFX framework type molecular sieve} and at least one second organic directing agent for directing the synthesis of a CHA framework type molecular sieve 
of
preparing a reaction mixture comprising sources of alumina , phosphorus , and , optionally , silica and further comprising at least one first organic directing agent for directing { HEAD ~ the synthesis } of { TAIL ~ an AFX framework type molecular sieve } and at least one second organic directing agent for directing the synthesis of a CHA framework type molecular sieve
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