STEP 0:
    added file: l1a.kt, l1b.kt
STEP 1:
    updated exports: l1b.kt, l1a.kt
STEP 2:
    updated exports: l1a.kt
STEP 3:
    removed inverse depends: l1b.kt, l1a.kt
STEP 4:
    modifications:
        U : l1a.4.kt -> l1a.kt
    modified ir: l1a.kt
    updated exports: l1b.kt
