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25
50
75
100
125
150
175
200
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250
)
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77
78
79
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81
82
83
84
85
86
87
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128
-
What Makes a Friend?
: " - "
- : , 3
Power Point
6- , Power Point : ""
, (, , ). :
PowerPoint
λ
1
...
77
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79
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83
84
85
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89
...
128
