can anyone tell me why I can't consolidate these factors?

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> summary(NPL_DF2$CATEGORY)
    AIR FUG   AIR STACK   LAND TREA   LANDF8795    OTH DISP   OTH LANDF POTW METALS      RCRA C   SI 5.5.3A   SI 5.5.3B    SURF IMP


                      
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