set-n-levels:5
get-min-key
insert:BWI:88
insert:LAX:42
insert:IAD:26
insert:DCA:67
insert:JFK:94
insert:ATL:48
insert:SFO:19
list-heap
get-max-level:BWI
get-max-level:LAX
get-max-level:IAD
get-max-level:DCA
get-max-level:JFK
get-max-level:ATL
get-max-level:SFO
get-min-key
list-heap
get-max-level:BWI
get-max-level:LAX
get-max-level:IAD
get-max-level:DCA
get-max-level:JFK
get-max-level:ATL
get-max-level:SFO
clear
get-min-key
insert:DCA:67
insert:IAD:26
insert:ATL:48
insert:SFO:19
insert:BWI:88
insert:JFK:94
insert:LAX:42
insert:ORD:73
insert:DFW:55
insert:SEA:13
insert:MIA:22
list-heap
get-min-key
list-heap
get-max-level:SEA
get-max-level:BWI
get-max-level:JFK
get-max-level:LAX
get-max-level:DFW
get-max-level:ORD
