level: 4
root:
  - EMO1_2ML_CU_Al_RDL:
    - primitives:
      - directional_couplers
      - edge_couplers
      - crossings
      - multimode_interferometers
      - photodetectors
    - composites:
      - MZIs
    - electronics:
      - resistors
      - capacitors
      - indectors
    - others:
      - logos