501 
 *** P:SO  
 *** P:SON  
 *** P:SONIC  
 *** P:SOUTHPARK  
 *** P:SP  
 *** P:SPA  
 *** P:SPACE  
 *** P:SPACEFLIGHT  
 *** P:SPAIN  
 *** P:SPK  
 *** P:SPRPK  
 *** P:SRB  
 *** P:SS  
 *** P:ST  
 *** P:START  
 *** P:STARW  
 *** P:STP  
 *** P:STR  
 *** P:SUE  
 *** P:SW