BEGIN{ NAMES[""]=""; ORDER[0]=""; NUM=0; } { if(NAMES[$2$3]!=$2$3){ NAMES[$2$3]=$2$3; ORDER[NUM]=$2$3; NUM++; } if(NAMES[$4$5]!=$4$5){ NAMES[$4$5]=$4$5; ORDER[NUM]=$4$5; NUM++; } } END{ for(i=0; i<NUM; i++){ LIST=ORDER[i]" "LIST; } print LIST; }