how is opal formed

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کوتاه

2:43

1:14:05

5:54

1:07

14:48

3:32

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2:11

2:42

2:08

3:08

1:52

کوتاه

2:55

1:06

4:58

5:15

2:55

6:06

28:10

1:30

1:21

2:32

1:21

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1:32

1:23

کوتاه

7:03

3:09

4:00

6:32

16:55

27:50

1:04

21:12