iterarion 1 root 1 blossoms{{1,2,3}} matching {(4,7), (5,6), (9, 10)}<br>
iteration 2 root {1,2,3} blossoms {{{1,2,3}, 4, 5}}  matching {({{1,2,3}, 4, 5},7), ({{1,2,3}, 4, 5},6), (9, 10)}<br>
iteration 3 root {{1,2,3}, 4, 5} blossoms {{{{1,2,3}, 4, 5}, 6, 7}}  matching {(9, 10)}<br>