Constructing a command structure
(2 (OBJ (REF DEFINITE) (COLOR GREEN) (SHAPE SPHERE)
(1 (ART (REF DEFINITE) (ROOT THE) (NUM S)))
(3 (NOUN (ROOT SPHERE) (NUM S)))
(4 (OPT-LOCATION (TYPE ABSOLUTE)
(1 (NOUN (ROOT POSITION)))
(2 (NUMBER (ROOT 3))))))))))