<s>
In	O
method	O
ringing	O
,	O
a	O
branch	O
of	O
change	O
ringing	O
,	O
the	O
ringing	O
pattern	O
known	O
as	O
plain	B-Algorithm
hunt	I-Algorithm
is	O
the	O
simplest	O
method	O
of	O
generating	O
continuously	O
changing	O
sequences	O
,	O
and	O
is	O
a	O
fundamental	O
building-block	O
of	O
method	O
ringing	O
.	O
</s>
<s>
Plain	B-Algorithm
hunt	I-Algorithm
is	O
limited	O
to	O
a	O
small	O
number	O
of	O
possible	O
different	O
changes	O
,	O
which	O
is	O
numerically	O
equal	O
to	O
twice	O
the	O
number	O
of	O
bells	O
that	O
are	O
hunting	O
.	O
</s>
<s>
However	O
,	O
by	O
introducing	O
deviations	O
from	O
the	O
plain	B-Algorithm
hunt	I-Algorithm
,	O
by	O
causing	O
some	O
of	O
the	O
bells	O
to	O
change	O
their	O
relationship	O
to	O
the	O
others	O
,	O
change	O
ringing	O
"	O
methods	O
"	O
were	O
developed	O
.	O
</s>
<s>
The	O
diagram	O
on	O
the	O
right	O
shows	O
how	O
plain	B-Algorithm
hunt	I-Algorithm
is	O
used	O
as	O
a	O
building-block	O
in	O
other	O
ringing	O
methods	O
.	O
</s>
<s>
Bell	O
number	O
1	O
is	O
always	O
plain	O
hunting	O
(	O
shown	O
in	O
blue	O
)	O
,	O
and	O
the	O
other	O
bells	O
plain	B-Algorithm
hunt	I-Algorithm
but	O
they	O
change	O
their	O
pattern	O
when	O
bell	O
number	O
1	O
is	O
the	O
first	O
bell	O
in	O
the	O
sequence	O
.	O
</s>
<s>
An	O
example	O
of	O
one	O
bell	O
which	O
is	O
deviating	O
from	O
plain	B-Algorithm
hunt	I-Algorithm
is	O
shown	O
in	O
red	O
.	O
</s>
<s>
This	O
variation	O
on	O
plain	B-Algorithm
hunt	I-Algorithm
means	O
that	O
up	O
to	O
60	O
changes	O
can	O
be	O
rung	O
without	O
repetition	O
in	O
this	O
case	O
.	O
</s>
<s>
There	O
are	O
thousands	O
of	O
ringing	O
methods	O
which	O
incorporate	O
blocks	O
of	O
plain	B-Algorithm
hunt	I-Algorithm
,	O
and	O
are	O
only	O
distinguished	O
by	O
different	O
deviations	O
at	O
set	O
points	O
.	O
</s>
