<s>
Sayre	B-General_Concept
's	I-General_Concept
paradox	I-General_Concept
is	O
a	O
dilemma	O
encountered	O
in	O
the	O
design	O
of	O
automated	B-Application
handwriting	I-Application
recognition	I-Application
systems	O
.	O
</s>
<s>
In	O
cases	O
of	O
ambiguity	O
,	O
probable	O
letter	O
sequences	O
can	O
be	O
compared	O
with	O
a	O
selection	O
of	O
properly	O
spelled	O
words	O
in	O
that	O
language	O
(	O
called	O
a	O
lexicon	B-Application
)	O
.	O
</s>
<s>
Here	O
is	O
where	O
Sayre	B-General_Concept
's	I-General_Concept
Paradox	I-General_Concept
comes	O
into	O
play	O
.	O
</s>
<s>
These	O
are	O
practical	O
incentives	O
for	O
finding	O
ways	O
of	O
circumventing	O
Sayre	B-General_Concept
's	I-General_Concept
Paradox	I-General_Concept
.	O
</s>
<s>
Since	O
improvement	O
of	O
this	O
sort	O
still	O
depends	O
on	O
accurate	O
segmentation	O
,	O
however	O
,	O
it	O
remains	O
subject	O
to	O
the	O
limitations	O
of	O
Sayre	B-General_Concept
's	I-General_Concept
Paradox	I-General_Concept
.	O
</s>
<s>
Recognition	O
proceeds	O
by	O
matching	O
HMMs	O
of	O
words	O
to	O
be	O
recognized	O
with	O
previously	O
prepared	O
HMMs	O
of	O
words	O
in	O
the	O
lexicon	B-Application
.	O
</s>
<s>
Instead	O
of	O
explicit	O
segmentation	O
techniques	O
,	O
most	O
automated	B-Application
handwriting	I-Application
recognition	I-Application
systems	O
today	O
employ	O
implicit	O
segmentation	O
in	O
conjunction	O
with	O
HMM-based	O
matching	O
procedures	O
.	O
</s>
<s>
The	O
constraints	O
epitomized	O
by	O
Sayre	B-General_Concept
's	I-General_Concept
Paradox	I-General_Concept
are	O
largely	O
responsible	O
for	O
this	O
shift	O
in	O
approach	O
.	O
</s>
