01 / 12TED-Ed≈ perkiraan levelC11:31–1:37 ’s .
02 / 12Sprouts≈ perkiraan levelA21:34–1:42
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03 / 12TED-Ed≈ perkiraan levelC13:51–3:59
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04 / 12TED-Ed≈ perkiraan levelB25:08–5:15
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05 / 12TED≈ perkiraan levelB26:01–6:08
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06 / 12TED-Ed≈ perkiraan levelC12:05–2:12
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07 / 12TED-Ed≈ perkiraan levelB20:06–0:15
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08 / 12CrashCourse≈ perkiraan levelB28:12–8:18
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09 / 12NBC News≈ perkiraan levelC10:02–0:13
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10 / 12TED≈ perkiraan levelC18:39–8:50
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11 / 12CrashCourse≈ perkiraan levelB16:32–6:39
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12 / 12CrashCourse≈ perkiraan levelB23:39–3:51
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