In the Schlage Classic Obverse family, there are three double letter keyways: CE, EF, and FG. These are unique keyways not composites. Each of these keyways is operated by its own key section key (plus any hierarchy keys).
For example, CE keyway is operable by CE section keys. CE keyway is not operable by C or E section keys.
For additional reference, here is the Schlage Classic Obverse Keyway Family chart.
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