<s>
Differential	B-Application
inheritance	I-Application
is	O
a	O
common	O
inheritance	B-Language
model	O
used	O
by	O
prototype-based	B-Application
programming	I-Application
languages	I-Application
such	O
as	O
JavaScript	B-Language
,	O
Io	B-Application
and	O
NewtonScript	B-Device
.	O
</s>
<s>
To	O
think	O
of	O
differential	B-Application
inheritance	I-Application
,	O
you	O
think	O
in	O
terms	O
of	O
what	O
is	O
different	O
.	O
</s>
