appends two or more collections to form a single collection
| std::push | add a single item at the end of a collection |
| std::dup | creates a concatenation of *n* copies of the specified collection |
| std_types::list | appends two or more lists |
| std_types::octet_string | appends two or more strings |
| std_types::quad_octet_string | appends two or more strings |