-prefix_push p1_
-options_file_yaml ex47-opt.yml
-prefix_pop

-prefix_push p1_
-options_file_yaml ex47-opt.yml
-prefix_pop

-prefix_push p2_
-options_file_yaml ex47-opt.yml
-prefix_pop

-prefix_push p3_
-options_string_yaml "name: value"
-prefix_pop

-prefix_push p3_
-options_string_yaml "name: value"
-prefix_pop

-prefix_push p4_
-options_string_yaml "name: value"
-prefix_pop