#include<bits/stdc++.h>
#define ll long long
using namespace std;
long long read(){
	long long x=0,f=1;char ch=getchar();
	while(!isdigit(ch))
	{if(ch=='-') f=-1;ch=getchar();}
	while(isdigit(ch)){x=x*10+ch-48;ch=getchar();}
	return x*f;
}
void write(long long x){
    if(x<0) putchar('-'),x=-x;
    if(x>9) write(x/10);
    putchar(x%10+'0');
}
const int N=150;
int T,n,m;
int a[N],ans,cnt[N],z[N],tp,del[N];
vector<pair<int,int> >fan;
queue<int>q;
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	T=read();
	while(T--){
		n=read();m=read();
		for(int i=1;i<=m;i++)cnt[i]=0;
		for(int i=1;i<=n;i++){
			a[i]=read();
			cnt[a[i]]++;
			del[i]=0;
		}
		fan.clear();
		while (q.size())q.pop();
		for(int i=1;i<n;i++){
			if(a[i]^a[i+1])fan.push_back(make_pair(i,i+1));
		}
		tp=0;
		for(int i=1;i<=n;i++){
			bool flag=0;
			while(tp>1&&a[z[tp-1]]!=a[i]){
				if(cnt[a[z[tp]]]==1){
					flag=1;
					int l=z[tp],r=z[tp];
					for(int j=z[tp]-1;j>=1;j--){
						if(!del[j]){
							if(l!=z[tp])fan.push_back(make_pair(z[tp],j));
							l=j;
						}
					}
					for(int j=z[tp]+1;j<=n;j++){
						if(!del[j]){
							if(r!=z[tp])fan.push_back(make_pair(z[tp],j));
							r=j;
						}
					}
					if(a[l]!=a[r]&&l!=z[tp]&&r!=z[tp])fan.push_back(make_pair(l,r));
					break;
				}
				cnt[a[z[tp]]]--;del[z[tp]]=1;fan.push_back(make_pair(z[tp-1],i));tp--;
			}
			if(flag)break;
			z[++tp]=i;
		}
		for(int i=4;i<=tp;i+=2)fan.push_back(make_pair(z[1],z[i]));
		write(fan.size());puts("");
		for(auto x:fan){
			printf("%d %d\n",x.first,x.second);
		}
	}
	return 0;
}