Part 1 (Acoustic)
Riff 1
e|--------------------------------|
b|-----3-3/4--------3-3/4--3------|
g|---0------------0----------3-0--| x1
d|-0------------0-----------------|
a|--------------------------------|
e|--------------------------------|
[ Tab from: https://www.guitartabs.cc/tabs/a/as_i_lay_dying/separation_tab.html ]
Riff 2
e|--------------------------------|
b|-----3-3/4--------3-3/4--3------|
g|---0------------0----------3-0--| x1
d|-1------------1-----------------|
a|--------------------------------|
e|--------------------------------|
Repeat Riff 1 (once)
then
e|--------------------3-----------|
b|-----3-3/4--------4-----4---3---|
g|---0------------0-----0---0-----|
d|-1------------1-----------------|
a|--------------------------------|
e|--------------------------------|