STEP 0:
    modifications:
        U : Annotation1.0.kt -> Annotation1.kt
        U : Annotation2.0.kt -> Annotation2.kt
    added file: Annotation1.kt, Annotation2.kt
STEP 1:
    modifications:
        U : Annotation3.1.kt -> Annotation3.kt
        U : Annotation4.1.kt -> Annotation4.kt
    added file: Annotation3.kt, Annotation4.kt
STEP 2:
