Š¿Žšƒ‚ƒoƒCƒ‹ƒQ[ƒ€
Žc”O
period of time =
1.
ŒŒ
2.
Šú
3.
—t
4.
’è
ƒŒƒxƒ‹3.
•ÏX
SDAL“‡‰pŒêŠwZ