case-01
[max-count]

case-02
[count]

case-03
[get-alone]

case-04
[get-all-key]
[get-entry]

case-05
[get-all-entry]

case-06
[set-alone]
[set-entry]

case-07
[del-entry]
[usable-key]
[add-entry]

case-08
[del-all-entry]
[add-entry]