public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  int t = s . nextInt ( ) ;
  for ( int i = 0 ;
  i < t ;
  i ++ ) {
    int n = s . nextInt ( ) ;
    int [ ] arr = new int [ n ] ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      arr [ j ] = s . nextInt ( ) ;
    }
    int max = - 1 ;
    int index = - 1 ;
    int value = - 1 ;
    for ( int j = 1 ;
    j < n - 1 ;
    j ++ ) {
      int mid = ( arr [ j - 1 ] + arr [ j + 1 ] ) / 2 ;
      int profit = Math . abs ( arr [ j - 1 ] - arr [ j ] ) + Math . abs ( arr [ j + 1 ] - arr [ j ] ) - Math . abs ( arr [ j - 1 ] - mid ) - Math . abs ( arr [ j + 1 ] - mid ) ;
      if ( profit > max ) {
        max = profit ;
        index = j ;
        value = mid ;
      }
    }
    if ( Math . abs ( arr [ 0 ] - arr [ 1 ] ) > max ) {
      max = Math . abs ( arr [ 0 ] - arr [ 1 ] ) ;
      index = 0 ;
      value = arr [ 1 ] ;
    }
    if ( Math . abs ( arr [ n - 2 ] - arr [ n - 1 ] ) > max ) {
      max = Math . abs ( arr [ n - 2 ] - arr [ n - 1 ] ) ;
      index = n - 1 ;
      value = arr [ n - 2 ] ;
    }
    arr [ index ] = value ;
    long count = 0 ;
    for ( int j = n - 1 ;
    j > 0 ;
    j -- ) {
      count = count + Math . abs ( arr [ j - 1 ] - arr [ j ] ) ;
    }
    System . out . println ( count ) ;
  }
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; int t = s . nextInt ( ) ; for ( int i = 0 ; i < t ; i ++ ) { int n = s . nextInt ( ) ; int [ ] arr = new int [ n ] ; for ( int j = 0 ; j < n ; j ++ ) { arr [ j ] = s . nextInt ( ) ; } int max = - 1 ; int index = - 1 ; int value = - 1 ; for ( int j = 1 ; j < n - 1 ; j ++ ) { int mid = ( arr [ j - 1 ] + arr [ j + 1 ] ) / 2 ; int profit = Math . abs ( arr [ j - 1 ] - arr [ j ] ) + Math . abs ( arr [ j + 1 ] - arr [ j ] ) - Math . abs ( arr [ j - 1 ] - mid ) - Math . abs ( arr [ j + 1 ] - mid ) ; if ( profit > max ) { max = profit ; index = j ; value = mid ; } } if ( Math . abs ( arr [ 0 ] - arr [ 1 ] ) > max ) { max = Math . abs ( arr [ 0 ] - arr [ 1 ] ) ; index = 0 ; value = arr [ 1 ] ; } if ( Math . abs ( arr [ n - 2 ] - arr [ n - 1 ] ) > max ) { max = Math . abs ( arr [ n - 2 ] - arr [ n - 1 ] ) ; index = n - 1 ; value = arr [ n - 2 ] ; } arr [ index ] = value ; long count = 0 ; for ( int j = n - 1 ; j > 0 ; j -- ) { count = count + Math . abs ( arr [ j - 1 ] - arr [ j ] ) ; } System . out . println ( count ) ; } }
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