directory tree one-liner [linux]

Create directory tree with one-liner:

for i in {a/{aa,ab,ac},b/{ba,bb,bc/{bca,bcb}},c}; do mkdir -p z/$i/{z1,z2}; done

Will produce below tree structure under directory z:

z/
|-a/
| |-aa/
| |  |-z1/
| |  |-z2/
| | 
| |-ab/
| |  |-z1/
| |  |-z2/
| |
| |-ac/
|    |-z1/
|    |-z2/
|
|-b/
| |-ba/
| |  |-z1/
| |  |-z2/
| |
| |-bb/
| |  |-z1/
| |  |-z2/
| |
| |-bc/
|    |-bca/
|    |   |-z1/
|    |   |-z2/
|    |
|    |-bcb/
|        |-z1/
|        |-z2/
|
|-c/
  |-z1/
  |-z2/