@startuml
rectangle "Feature" as A
rectangle "Optional" as B
rectangle "Required" as C
 
A --0 B
A --@ C

rectangle "Feature" as E
note left
  Sub-features Combination
end note
rectangle "Sub Feature 1" as F
rectangle "Sub Feature 2" as G
 
E *-- F
E *-- G

rectangle "Feature" as H
note right
  Exclusive Sub-features
end note

rectangle "Alternative\nSubFeature 1" as I
rectangle "Alternative\nSubFeature 2" as J

H o-- I
H o-- J

F -[dotted]> B : require


C <-[dotted]> J : exclusive

rectangle "Product" as R

R --0 A
R --0 E : optional
R --@ H : required


skinparam monochrome true
skinparam shadowing false
skinparam defaultFontName Courier
@enduml