There’s no clear boundary between Five and Four. Fours with Five-wings are virtually indistinguishable from Fives with Four-wings. For instance, the very popular Eclectic Energies test (eclecticenergies.com) gives this as a summary of the Five-Four distinction:

“Intellectual Fours tend to mistakenly type themselves as Fives, and a heavy wing can certainly exacerbate this tendency.  Fours, however, unlike Fives, tend to be self-revealing and comfortable with emotional expression.” 
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