graph TB
sq[Square shape] --> ci((Circle shape))
subgraph A subgraph
od>Odd shape]-- Two line edge comment --> ro
di{Diamond line break} -.-> ro(Rounded square shape)
di==>ro2(Rounded square shape)
end
classDef green fill:#9f6,stroke:#333,stroke-width:2px;
classDef orange fill:#f96,stroke:#333,stroke-width:4px;
class sq,e green
class di orange