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@startuml
scale 900 width
[*] --> GUI : User input
GUI -d-> PYTHON_DATA : write
PYTHON_DATA -u-> GUI : read
PYTHON_DATA : Python data is authoritative data.
state join_state <<join>>
PYTHON_DATA --> join_state : Writes only, MLT data is never read
join_state --> MLT_C_DATA
note left of join_state : CPython extension interface to C
MLT_C_DATA : MLT C data is copy of authoritative Python data.
note right of MLT_C_DATA : Data is destroyed on save,\nrecreated on load
@enduml
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