DV: A down vertical mark
DV: A down vertical mark
RH: A right horizontal mark
RH: A right horizontal mark
RHBB: A right horizontal barbell mark
NWC: A northwest corner connector
NEC: A northeast corner connector
SEC: A southeast corner connector
SWC: A southwest corner connector
MARKS: DV=2 RH=2 RHBB=1
CONNECTORS: NEC=1 SEC=1 SWC=1 NWC=1