Bhlowe

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

// create and solve 3x3 scramble square puzzles.
// tiles are squares, are arranged in 3x3 grid.
// each tile has 4 pictures, one per side.
// Each picture is either a "head" or "tail" (bottom or top half of picture)
// There are typically 4 pictures, represented by AaBbCcDd