android Ġ{ ĊĠ Ġsource Sets Ġ{ ĊĠĠĠ Ġcreate (" set 1 ") Ġ{ ĊĠĠĠĠĠ Ġset Root (" source 1 ") ĊĠĠĠ Ġ} ĊĠĠĠ Ġcreate (" set 2 "). set Root (" source 2 ") ĊĠ Ġ} ĊĠ Ġsource Sets . create (" set 3 "). set Root (" source 3 ") Ċ } Ċ android . source Sets . create (" set 4 "). set Root (" source 4 ") Ċ