A is made up of two segments,
and 
, formed by cutting the chain at four points,
, 
, 
and 
.
The split value between 
and 
must show them to be
correlated when compared with MSV. B can be made of up to
three segments, depending on the postions of the boundaries.
The split value is calculated
for all possible segment 
's formed by varying
, 
, 
and 
. The maximum split value
is stored, together with the corresponding values of 
, 
,
and 
, called
, 
, 
and 
, which
define 
and 
. The maximum split value
is compared with MSV and if 
and 
are
not correlated, the parent domain is split at this point. 
goes on to form a two segment child domain.