merged_ID	child_1	child_2
node_1	osr1-2_m1_matrix-clustering_query_matrices.tab_1	osr1-2_m2_matrix-clustering_query_matrices.tab_2
node_2	osr1-2_m3_matrix-clustering_query_matrices.tab_3	osr1-2_m4_matrix-clustering_query_matrices.tab_4
node_3	node_1	node_2
