half-beam is part of:
    50%  beam
    25%  brick  (indirectly)

half-beam contains:

Full expansion for half-beam:
   100%  5L Technic Half-Beam
    80%  3L Technic Lift-Arm
    70%  4L Technic Lift-Arm
    70%  5L Right-Angle Technic Lift-Arm