### Chain
#                                    
#  opeth - [s1] - immortal - [s2] - grave - [s3] -  syl -  [s4] - nile
#
#
#                  

# switches 

SWITCH s1
SWITCH s2   
SWITCH s3   
SWITCH s4   
HOST debian  opeth s1
HOST debian  immortal s1 s2 
HOST debian  grave    s2 s3 
HOST debian  syl      s3 s4       
HOST debian  nile     s4