This test passes if the depth and height of braces match the maximum depth and height of its siblings.

{
 
{
 
{
 
{
x	y	z	x	y	z	x	y	z	x	y	z	x	y	z 
 
{
1
2
3
4
-
5
6
*
1
2
3
4
5
6
7
8
9
10
11
+
7
8
9
10
/
1
2
1
2
3
4
5
5
6
 
{
|
}
 
{
p
{
|


PASS symmetric stretching 
PASS large depth 
PASS large height 
PASS mtable 
PASS several siblings with different heights/depths 
PASS testing several operators in one mrow 
PASS testing with non-stretchy mo