I think the song mainly consists of these basslines in varied orders.

G-----------------------------------------------------------------------------
D-----------------------------------------------------------------------------
A---0-0-0-0-0-0-0-0-3-3-3-3-3-3-3-3-2-2-2-2-2-2-2-2-3-3-3-3-3-3-3-3-----------
E-----------------------------------------------------------------------------


G-----------------------------------------------------------------------------
D-------2---1b-------------5b--4-----------2---1b-----------------------------
A---0-3---0-----0-3---0----------------0-3---0-----0-3---x-x-x-x-x-x-x--------
E-----------------------------------------------------------------------------


G-----------------------------------------------------------------------------
D-----------------------------------------------------------------------------
A---0h1p0-0-0-0h1p0--0-0h1p0--0-0-0-0h1p0-------------------------------------
E-----------------------------------------3-----------------------------------