[f] Functional requirements

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[core] Core

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[dsl] DSLs

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[i] Interface requirements

[cli] Command line interface

[cli.core] Essential commands

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[cli.trace] 'trace' command family

[cli.pert] 'pert' command family

[cli.fpa] 'fpa' command family

[api] API

[web] Web application

[n] Non-functional requirements

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[d] Design constraints

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