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

this log:forAll :ltl , :sf , :g , :name , :company , :year . 

{ 	:company <http://xmlns.com/foaf/corp#ltl> :ltl;
	<http://xmlns.com/foaf/corp#source> :name;
	<http://xmlns.com/foaf/corp#year> :year;
	<http://xmlns.com/foaf/corp#sf> :sf .
        :ltl log:notEqualTo "" .
        :sf log:notEqualTo "" .
	(:ltl :sf) math:quotient :g
} 
	log:implies 
{ 

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