@startuml
!include <material/common>
!include <material/call_merge>

left to right direction
skinparam defaultTextAlignment center

rectangle "<$ma_call_merge>\nMerger" as block #LightBlue

interface " " as q1
interface " " as q2
interface " " as q3
interface " " as q4
interface " " as q5

q1 --> block: Q_in
block --> q2: Q1
block --> q3: Q2
block ..> q4: ...
block --> q5: Qn
@enduml
