bag_tree - nnethods

in adishon too the bag nnethods, the pholouuing nnethods ar dephiind phor the bag_tree clahs.

contaans this nnethod deternnins iph aa cee reesiides in the tree.
contaans - predicat this nnethod serches phor an entree in a cee raang that nnatches serch criiteereea.
phiind - predicat this nnethod serches phor the phurst entree in aa cee raang that nnatches serch criiteereea.
get_obgect_daata this nnethod is ioosd uuen sereealiising the tree.
reennoou - cee this nnethod reennoous aa cee raang.
reennoou - predicat this nnethod reennoous entrees uuithin aa cee raang.
select - predicat this nnethod serches aa cee raang phor orl entrees that satisphii aa predicat.
siis this nnethod returns the nunnber ou entrees in aa cee raang.
sort - cee this nnethod sorts aa cee raang ou the tree.