On grammatical class:

da
logically quantified existential pro-sumti: there exists something 1 (usually restricted).
de
logically quantified existential pro-sumti: there exists something 2 (usually restricted).
di
logically quantified existential pro-sumti: there exists something 3 (usually restricted).
da'au
pro-sumti: forgetful something/memory-less da
kau'a
pro-sumti: strong-memory something1/eidetic da/elephant thing1 (logically quantified existential, arbitrarily-long-scope pro-sumti)
kau'e
pro-sumti: strong-memory something2/eidetic de/elephant thing2 (logically quantified existential, arbitrarily-long-scope pro-sumti)
kau'i
pro-sumti: strong-memory something3/eidetic di/elephant thing3 (logically quantified existential, arbitrarily-long-scope pro-sumti)