struct level2_entry {
	int foo;
	int bar;
	AST_LIST_ENTRY(level2_entry) list;	
};

AST_LIST_HEAD(level2_list, level2_entry);

struct level1_entry {
	int baz;
	char *farble;
	level2_list level2;
	AST_LIST_ENTRY(level1_entry) list;
};

AST_LIST_HEAD_STATIC(level1_list, level1_entry);