@startuml
!include <material/forklift>

left to right direction
skinparam defaultTextAlignment center

rectangle "<$ma_forklift>\nTransporter" as block #Tan

interface " " as q1
interface " " as q2
interface " " as q3
interface " " as q4
interface " " as q6
interface " " as q7

q1 --> block: input
block -u-> q2: blocked
block -u-> q3: restock
block -d-> q4: output
block -r-> q6: next
q7 -r-> block: previous
@enduml
