Š¿Žšƒ‚ƒoƒCƒ‹ƒQ[ƒ€
Žc”O
period of time =
1. Τ
2. –â
3. Šú
4. ŽM

ƒŒƒxƒ‹3. •ύX
SDAL“‡‰pŒêŠwZ