<s>
A	O
unate	B-Language
function	I-Language
is	O
a	O
type	O
of	O
boolean	O
function	O
which	O
has	O
monotonic	O
properties	O
.	O
</s>
<s>
If	O
for	O
every	O
f	O
is	O
either	O
positive	O
or	O
negative	O
unate	O
in	O
the	O
variable	O
then	O
it	O
is	O
said	O
to	O
be	O
unate	O
(	O
note	O
that	O
some	O
may	O
be	O
positive	O
unate	O
and	O
some	O
negative	O
unate	O
to	O
satisfy	O
the	O
definition	O
of	O
unate	B-Language
function	I-Language
)	O
.	O
</s>
