Š¿Žšƒ‚ƒoƒCƒ‹ƒQ[ƒ€
Žc”O
period of time =
1.
Šú
2.
”½
3.
•¨
4.
ŠÝ
ƒŒƒxƒ‹3.
•ÏX
SDAL“‡‰pŒêŠwZ