Angular 4: Conditional parent template

On Angular 4, assuming that I have 5 components/routes and certain sets use specific parent templates, e.g.:

a.component --> parent component
b.component, c.component --> parent2 component
e.component, f.component --> parent3 component

Currently, the parent template is handled by app.component and child components are rendered inside a tag, say, <router-outlet>. My questions is, is there a way to make the parent template conditional based on the rules stated above?

Thank you.

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/17/angular-4-conditional-parent-template/
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