BrainFuck in BrainFuck

# 42 in c0
# 60 in c1
  >> +++ +++        6 in c2
[ << +++ +++ +      7
  >  +++ +++ +++ + 10
  > - ] << end at c0

# 42 in c2;c3;c4
# 84 in c7;c8
[ >> + > + > + >>> ++ > ++ <<<<<<<< - ]

# 60 in c5;c6
> [ >>>> + > + <<<<< - ]

> +    c2 : plus
> +++  c3 : minus
> ++++ c4 : dot
>      c5 : left
> ++   c6 : right

>>>> move to c10

# 9 in c9
+++
[ < +++ > - ]

# add 9 to c7;c8
< [ << + > + > - ]
<< -- : open bracket in c7

<<<<< move to c2