<s>
Reification	B-General_Concept
in	O
natural	B-Language
language	I-Language
processing	I-Language
refers	O
to	O
where	O
a	O
natural	O
language	O
statement	O
is	O
transformed	O
so	O
actions	O
and	O
events	O
in	O
it	O
become	O
quantifiable	B-Language
variables	O
.	O
</s>
<s>
automated	B-Application
theorem	I-Application
provers	I-Application
and	O
model	B-Application
checkers	I-Application
)	O
for	O
manipulating	O
it	O
.	O
</s>
<s>
The	O
reified	O
forms	O
are	O
sometimes	O
called	O
quasi-logical	O
forms	O
,	O
and	O
the	O
existential	O
variables	O
are	O
sometimes	O
treated	O
as	O
Skolem	B-Application
constants	I-Application
.	O
</s>
