<s>
All	O
vertices	O
of	O
a	O
Reeve	B-Architecture
tetrahedron	I-Architecture
are	O
lattice	O
points	O
(	O
points	O
whose	O
coordinates	O
are	O
all	O
integers	O
)	O
.	O
</s>
<s>
The	O
volume	O
of	O
the	O
Reeve	B-Architecture
tetrahedron	I-Architecture
with	O
vertex	O
is	O
.	O
</s>
