I’m able to do a matrix with brackets, but i need to place a row on top of the matrix, and outside the brackets.

best i can do so far is this:

```
size 15 P ~ ~ ~ = ~ ~ ~ ~ ~size 12 stack{ ~ #i ~# j ~ # k ~ # l ~ # m ~}
left (
stack{ ~ i# .06 # .1 # .16# .26 # .42 }
~~
stack{~ j#.42 #.06 # .1# .16 # .26}
~~
stack{ ~ k #.26 # .42 # .06 # .1 # .16}
~~
stack{~ l #.16 # .26 # .42# .06 # .1}
~~
stack{~ m #.1 # .16 # .26# .42 # .06}
right )
```

thank you!

*(formatting editing by ajlittoz – hoping not having changed the meaning)*