@prefix : <#> .
@prefix log: <http://www.w3.org/2000/10/swap/log#> .
@prefix math: <http://www.w3.org/2000/10/swap/math#> .

this log:forAll :ca , :cr , :cl , :name , :company , :year  . 

{ 	:company <http://xmlns.com/foaf/corp#cr> :cr;
	<http://xmlns.com/foaf/corp#source> :name;
	<http://xmlns.com/foaf/corp#year> :year;
	<http://xmlns.com/foaf/corp#cl> :cl . 
	:cr log:notEqualTo "" . 
	:cl log:notEqualTo "" . 
	(:cr :cl) math:product :ca
} 
	log:implies 
{ 

 	:company <http://xmlns.com/foaf/corp#ca> :ca;
	<http://xmlns.com/foaf/corp#source> :name ;
	<http://xmlns.com/foaf/corp#year> :year  .
} .