add Lucas
add Mike
add Dustin
add Will
add El
size
print
preorder
find Mike
find Nancy
add Nancy
size
print
add Mike
add El
find Max
add Max
print
find Max
find Barb
add Barb
print
save stranger.tree
clear
size
print
add Demigorgon
print
load stranger.tree
size
print
add Jim
add Joyce
print
load stranger.tree
print
quit