TwistyPuzzleLib

///////////////////////////////////////////////////////////////////////////////////////////////////

  private void addMove(int[] move, int axis, int twist)

    {

    move[0] = axis;

    move[1] = (1<<2);

    move[2] = (twist==2 ? -1:twist);

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  private int[][] constructTipMoves(int[] twist)

    {

    int total = 0;

    for(int i=0; i<4; i++)

      if( twist[i]!=0 ) total++;

    if( total>0 )

      {

      int[][] moves = new int[total][3];

      int index=0;

      if( twist[0]!=0 ) { addMove(moves[index],1,twist[0]); index++; }

      if( twist[1]!=0 ) { addMove(moves[index],0,twist[1]); index++; }

      if( twist[2]!=0 ) { addMove(moves[index],3,twist[2]); index++; }

      if( twist[3]!=0 ) { addMove(moves[index],2,twist[3]);          }

      return moves;

      }

    return null;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

// extra = cornerTips

  @Override

  int[][] extraInfo(int[][] moves, int[] extra)

    {

    int[][] tipMoves = constructTipMoves(extra);

    int len1 = (   moves==null ? 0:   moves.length);

    int len2 = (tipMoves==null ? 0:tipMoves.length);

    int[][] ret = new int[len1+len2][3];

    if( len1>0 ) System.arraycopy(   moves, 0, ret,    0, len1);

    if( len2>0 ) System.arraycopy(tipMoves, 0, ret, len1, len2);

    return ret;

    }

  int getMinScramble()