@ @pbjïØ Üa@ @QRR 16 42 ( ) 21 ( ) 15 ( ) 12 ( ) [AUST.MC 1993] ( ) . OFF ON OFF 16 ( ) 12 ( ) 10 ( ) 8 () : 4×4 [AUST.MC 1992] ( ) .. 90 ( ) 86 ( ) 48 ( ) 36 ( ) ) . [AUST.MC 1998] ( ) 18 ( ) 12 ( ) ( 8 6 6( ) 4 () 3 [AUST.MC 1994] ( ) 6 .