Š¿Žšƒ‚ƒoƒCƒ‹ƒQ[ƒ€
Žc”O
period of time =
1.
‹ê
2.
Šú
3.
‹æ
4.
—t
ƒŒƒxƒ‹3.
•ÏX
SDAL“‡‰pŒêŠwZ