<s>
ignoring	O
the	O
effects	O
of	O
gravity	O
)	O
,	O
there	O
are	O
ten	O
degrees	O
of	O
freedom	O
of	O
the	O
isometries	O
,	O
which	O
may	O
be	O
thought	O
of	O
as	O
translation	B-Algorithm
through	O
time	O
or	O
space	O
(	O
four	O
degrees	O
,	O
one	O
per	O
dimension	O
)	O
;	O
reflection	O
through	O
a	O
plane	O
(	O
three	O
degrees	O
,	O
the	O
freedom	O
in	O
orientation	O
of	O
this	O
plane	O
)	O
;	O
or	O
a	O
"	O
boost	O
"	O
in	O
any	O
of	O
the	O
three	O
spatial	O
directions	O
(	O
three	O
degrees	O
)	O
.	O
</s>
<s>
Instead	O
of	O
boosts	O
,	O
it	O
features	O
shear	B-Algorithm
mappings	I-Algorithm
to	O
relate	O
co-moving	O
frames	O
of	O
reference	O
.	O
</s>
<s>
a	O
pion	O
being	O
composed	O
of	O
a	O
quark-anti-quark	O
pair	O
)	O
.	O
</s>
