switch syntax

[saku]

hello,

can i optimize this somehow:

switch ($cond) {

case 'a' : command_abc
break;
case 'b' : command_abc
break;
case 'c' : command_abc
break;
case 'd' : command_de
break;
case 'e' : command_de
break;
...
...

default : command_x

}

[jowatkins]

switch ($cond) { 

case 'a' : 
case 'b' :
case 'c' : 
  command_abc 
case 'd' : 
case 'e' : 
  command_de 
... 
... 

default : command_x 

}

[bernouli]

switch ($cond) { 
case 'a' : 
case 'b' :
case 'c' : 
  command_abc ;
  break;
case 'd' : 
case 'e' : 
  command_de ;
   break;
default : command_x; break;
}