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m Hero System Numeral system Genitourinary system System Architect Haematopoietic system Peripheral nervous system Inquisitorial system Causal system System 2 System profiler Physical system System time Airline reservations system System monitor Human musculoskeletal system Systems theory Hybrid system Honor system Olfactory system Earth system science System identification Positioning system Public address system Parasympathetic nervous system Computer reservation system D20 System THE multiprogramming system Apothecaries' system Sympathetic nervous system CP System Multi-agent system McIntyre system Complex system IBM System/38 Acorn System Visual system Communications system Busin