I hope I can explain this so it makes sense.. the g run which bluegrass pickers use (many of them too often) goes something like this.. two rapid picks of the low e, covered,one pick of the 5th string open, then hammer on that string, then once open on the 4th, then hammer on same string, thenclose that same string, then open it and pull off, then pick the g string open. Or, you can pick the 4th string again instead of hammering on. Good luck, it takes much longer to tell it than to do it.