BEGIN{
    FS=OFS="\t"
}
{
    a[$1"\t"$2"\t"$3]=$0
    if(!pair[$1"\t"$2] || pair[$1"\t"$2] < $3){
        pair[$1"\t"$2]=$3
    }
}
END{
    for(i in pair){
        split(i,g,"\t")
        if(!pair[g[2]"\t"g[1]]){
            print a[i"\t"pair[i]]
        }else if(pair[g[2]"\t"g[1]] == pair[g[1]"\t"g[2]]){
			print a[i"\t"pair[i]]
			delete pair[g[2]"\t"g[1]]
		}else if(pair[g[2]"\t"g[1]] < pair[g[1]"\t"g[2]]){
			print a[i"\t"pair[i]]
		}
    }
}