++++++++++ # counter := 10
[ # repeat 10 times
>+++++++ # counter *: 1 7
>++++++++++ # counter *: 1 7 10
>+++ # counter *: 1 7 10 3
>+ # counter *: 1 7 10 3 1
<<<<- # decrement counter
] # 0 70 100 30 10
>++. # 70 add 2 = H
>+. # 100 add 1 = e
+++++++.. # 101 add 7 = ll
+++. # 108 add 3 = o
>++. # 30 add 2 = SPC
# 0 72 111 32
# ^
<<+++++++++++++++. # 72 add 15 = W
>. # 111 = o
+++. # 111 add 3 = r
------. # 114 sub 6 = l
--------. # 108 sub 8 = d
>+. # 32 add 1 = !
# 0 87 100 33
# ^
>. # 0 = NUL