<s>
XT9	B-Application
is	O
a	O
text	B-General_Concept
predicting	I-General_Concept
and	O
correcting	O
system	O
for	O
mobile	O
devices	O
with	O
full	O
keyboards	O
rather	O
than	O
the	O
3x4	O
keypad	O
on	O
old	O
phones	O
.	O
</s>
<s>
It	O
is	O
a	O
successor	O
to	O
T9	O
,	O
a	O
popular	O
predictive	B-General_Concept
text	I-General_Concept
algorithm	O
for	O
mobile	O
phones	O
with	O
only	O
numeric	O
pads	O
.	O
</s>
