<s>
The	O
tool	O
has	O
a	O
search	B-Application
mode	O
that	O
assists	O
the	O
user	O
in	O
looking	O
for	O
items	O
or	O
concepts	O
that	O
may	O
be	O
present	O
in	O
common	O
between	O
two	O
distinct	O
sets	O
of	O
articles	O
.	O
</s>
<s>
Another	O
context	O
for	O
using	O
the	O
search	B-Application
mode	O
is	O
when	O
the	O
user	O
wants	O
to	O
find	O
information	O
that	O
is	O
present	O
in	O
one	O
field	O
that	O
may	O
be	O
relevant	O
to	O
another	O
field	O
of	O
inquiry	O
.	O
</s>
<s>
The	O
user	O
will	O
be	O
guided	O
through	O
two	O
PubMed	B-Library
searches	O
to	O
retrieve	O
bio-medical	O
articles	O
from	O
the	O
MEDLINE	O
database	O
:	O
the	O
first	O
search	B-Application
defines	O
"	O
literature	O
A	O
"	O
and	O
the	O
second	O
defines	O
"	O
literature	O
C.	O
"	O
The	O
program	B-Application
then	O
generates	O
a	O
"	O
B-list	O
"	O
of	O
words	O
and	O
phrases	O
found	O
in	O
the	O
titles	O
of	O
both	O
sets	O
of	O
literature	O
.	O
</s>
<s>
The	O
B-list	O
is	O
displayed	O
ranked	O
by	O
relevance	O
,	O
and	O
can	O
be	O
restricted	O
to	O
certain	O
semantic	B-Application
categories	O
(	O
e.g.	O
</s>
