Answer 7.3

7.3

=> s c/els and o/els and (t1 or t2 or t3)/pg and 3/elc and i10/syst 
        263012 C/ELS
                 (C/ELS)
        169103 O/ELS
                 (O/ELS)
          3831 T1/PG
          1711 T2/PG
           879 T3/PG
        166441 3/ELC
         20797 I10/SYST
L1           9 C/ELS AND O/ELS AND (T1 OR T2 OR T3)/PG AND 3/ELC AND
               I10/SYST

BESSERE MÖGLICHKEIT:

=> s carbonyl/cns and (t1 or t2 or t3)/pg and i10/syst
            45 CARBONYL/CNS
          3831 T1/PG
          1711 T2/PG
           879 T3/PG
         20797 I10/SYST
L2           8 CARBONYL/CNS AND (T1 OR T2 OR T3)/PG AND I10/SYST