#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2")
 
 
    #define int long long
    
 
#define YES cout<<"YES\n";return; 
#define NO cout<<"NO\n";return; 
#define write(a) cout<<a<<"\n";return; 
#define F first 
#define S second
 
using namespace std;
using vi=vector<int>; 
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count()); //uid<int> u1(5, 10); u1(rnd);
long long powmod(long long a,long long b,long long mod) {
        if (b==0 || a==1)  {if (mod==1) return 0; else return 1; }
       
        if (b%2==0) { long long k=powmod(a,b/2,mod); return (k*k)%mod; }
        else {long long k=powmod(a,b/2,mod); return ( (k*k) %mod *a)% mod; }
}
long long gcd(long long a, long long b) {
    if (a==0) return b;
    if (b==0) return a;
    if (a>b) return gcd(a%b,b); else return gcd(b%a,a);
}
int prime(int p) { // 1 - простое
if (p==1) return 0; 
    for (int i=2;i*i<=p;i++) {
    if (p%i==0 && i<p) return i;  
    }
    return 1;
}
        
 int inv(int a, int mod) {
    return powmod(a,mod-2,mod); 
}
            
 int random_modul() {
        
    uniform_int_distribution <int> u1(1e9, 2e9);
    int pepega=u1(rnd); 
    while (prime(pepega)!=1) pepega=u1(rnd); 
    return pepega; 
}
    
template <typename T1> void ifmax(T1 &max, T1 kek) {
    if (kek>max) max=kek; 
    return; 
}
template <typename T1> void ifmin(T1 &min, T1 kek) {
    if (kek<min) min=kek;
    return; 
}
     
 
template <typename T1> istream& operator>> (std::istream& in, pair<T1,T1> & a) {
in>>a.first>>a.second; 
return in; 
    
}
    
template <typename T1> istream& operator>> (std::istream& in, vector<T1> & a) {
    for (int i=0;i<a.size();i++) in>>a[i]; 
    return in;
} 
     
template <typename T1>  ostream& operator<< (std::ostream& out, vector <T1> &b) {
    for (int i=0;i<b.size();i++) out<<b[i]; 
    return out; 
} 
template <typename T1> void sort(vector <T1> &m) {
    sort(m.begin(),m.end());
}
 
template <typename T1> void reverse(vector <T1> &m) {
 reverse(m.begin(),m.end());
}
   
 
void solve () {
           
           
     /* ---- !! F, S !!  ---- */
         
         
        int a;
        cin>>a;
        vi m(a);
        cin>>m; 
        
        int min1=1000000000000000;
        int ans=0; 
        int max1=0; 
        for (int i=0;i<a;i++) {
            if (i+1<a) ans+=abs(m[i+1]-m[i]);
            if (i && i+1<a) ifmax(max1,abs(m[i]-m[i-1])+abs(m[i+1]-m[i])-abs(m[i-1]-m[i+1])); 
            if (i==0) ifmax(max1,abs(m[i]-m[i+1]));
            if (i==a-1) ifmax(max1,abs(m[i]-m[i-1])); 
        }
        cout<<ans-max1<<"\n"; return; 
        sort(m);
        
        cout<<min(m[a-2]-m[0],m[a-1]-m[1])<<"\n"; return; 
        for (int i=0;i<a;i++) {
            ifmax(max1,m[i]);
            ifmin(min1,m[i]); 
        }
        cout<<max1-min1<<"\n"; 
        
        
     
    /* --------- */  
    return;
    }
         
         
         
    signed main() {
   ios_base::sync_with_stdio(0);
   cin.tie(0);
   cout.tie(0); 
           
           
      cout<<fixed<<setprecision(10); 
           
           
        int multitest = 1 ;    
           
      int tututu;
      tututu=1;
              
      if (multitest) cin>>tututu; // если нет запросов, то закоментить
            
      for (int qwerty=0;qwerty<tututu;qwerty++) solve();
          
           
    return 0;
}