What commands or instructions in Gradle can be used to set dependencies between different modules of a project?

In Gradle, the following constructs are used to define relationships between project modules:

• In the settings.gradle file, project modules are specified using include:

include ':app', ':library'

• In the build.gradle of a module that depends on another, a dependency is added via implementation project(':library'):

dependencies {
    implementation project(':library')
}

This allows the app module to use code from the library module. Thus, the relationship between modules is established through specifying dependencies in dependencies and registering modules in settings.gradle.