test_rl_frag_combine
if (strcmp(test, "123") == 0) test_rl_frag_combine(&vol, attr1, attr2, attr3);
else if (strcmp(test, "132") == 0) test_rl_frag_combine(&vol, attr1, attr3, attr2);
else if (strcmp(test, "213") == 0) test_rl_frag_combine(&vol, attr2, attr1, attr3);
else if (strcmp(test, "231") == 0) test_rl_frag_combine(&vol, attr2, attr3, attr1);
else if (strcmp(test, "312") == 0) test_rl_frag_combine(&vol, attr3, attr1, attr2);
else if (strcmp(test, "321") == 0) test_rl_frag_combine(&vol, attr3, attr2, attr1);