#include <bits/stdc++.h>

using i64 = long long;

void solve() {
    int n;
    std::cin >> n;
    
    std::vector<std::vector<int>> ans;
    std::multiset<std::pair<int, int>> a;
    for (int i = 1; i <= n; i++) {
        int s;
        std::cin >> s;
        auto it = a.lower_bound({s + 1, 0});
        int x;
        if (it == a.begin()) {
            x = ans.size();
            ans.push_back({i});
        } else {
            it--;
            x = it->second;
            ans[x].push_back(i);
            a.erase(it);
        }
        a.emplace(s, x);
        a.emplace(s, x);
    }
    std::cout << ans.size() << "\n";
    for (auto v : ans) {
        std::cout << v.size();
        for (auto i : v) {
            std::cout << " " << i;
        }
        std::cout << "\n";
    }
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int t;
    std::cin >> t;
    
    while (t--) {
        solve();
    }
    
    return 0;
}