My Bookmark Key Binding for sublime Text 3

It is hard to use F2 for bookmarks in ST3, so I changed like this,

 

{ “keys”: [“ctrl+b”,”ctrl+b”], “command”: “toggle_bookmark” },
{ “keys”: [“ctrl+b”,”ctrl+down”], “command”: “next_bookmark” },
{ “keys”: [“ctrl+b”,”ctrl+up”], “command”: “prev_bookmark” },
{ “keys”: [“ctrl+b”,”ctrl+delete”], “command”: “clear_bookmarks” },
{ “keys”: [“ctrl+b”,”ctrl+a”], “command”: “select_all_bookmarks” },