<s>
A	O
cardinal	B-Application
tree	I-Application
(	O
or	O
trie	B-General_Concept
)	O
of	O
degree	O
k	O
,	O
by	O
analogy	O
with	O
cardinal	O
numbers	O
and	O
by	O
opposition	O
with	O
ordinal	B-Application
trees	I-Application
,	O
is	O
a	O
rooted	O
tree	O
in	O
which	O
each	O
node	O
has	O
k	O
positions	O
for	O
an	O
edge	O
to	O
a	O
child	O
.	O
</s>
<s>
For	O
instance	O
,	O
a	O
binary	O
tree	O
is	O
a	O
cardinal	B-Application
tree	I-Application
of	O
degree	O
2	O
.	O
</s>
