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public <rsm> = [the] <furniture> is ( <IN_FRONT_OF> | <BEHIND> | <RIGHT_OF> | <LEFT_OF> ) of the <furniture>;
<furniture> = ( ( sofa | couch ) | chair | cupboard | shelf | table ) ;
<IN_FRONT_OF> = ( before | front );
<BEHIND> = ( behind | after );
<LEFT_OF> = ( left );
<RIGHT_OF> = ( right );