On grammatical class:

dau'a
gafyzmico: Reset all default specifications of immediately previous word to official definition specifications hereinafter (permanently)
de'au
gafyzmico: Cancellation (permanent) of all defaults in immediately previous word
de'oi
Cancellation (instant-/usage-wise; temporary) of all defaults in immediately previous word
doi'a
gafyzmico: Reset all default specification of the immediately previous word to their respective discourse-external/official definition specifications for this instance/usage only.