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                      U16-1 Listening and Understanding.mp3                  
               
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                      U16-2 Pronunciation.mp3                  
               
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                      U16-3 Pattern Practice.mp3                  
               
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                      U16-4 Listening.mp3                  
               
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                      U17-1 Listening and Understanding.mp3                  
               
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                      U17-2 Pronunciation.mp3                  
               
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                      U17-3 Pattern Practice.mp3                  
               
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                      U17-4 Listening.mp3                  
               
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                      U18-1 Listening and Understanding.mp3                  
               
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                      U18-2 Pronunciation.mp3                  
               
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                      U18-3 Pattern Practice.mp3                  
               
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                      U18-4 Listening.mp3                  
               
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                      U19-1 Listening and Understanding.mp3                  
               
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                      U19-2 Pronunciation.mp3                  
               
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                      U19-3 Pattern Practice.mp3                  
               
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                      U19-4 Listening.mp3                  
               
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                      U20-1 Listening and Understanding.mp3                  
               
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                      U20-2 Pronunciation.mp3                  
               
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                      U20-3 Pattern Practice.mp3                  
               
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                      U20-4 Listening.mp3                  
               
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                      U21-1 Listening and Understanding.mp3                  
               
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                      U21-2 Pronunciation.mp3                  
               
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                      U21-3 Pattern Practice.mp3                  
               
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                      U21-4 Listening.mp3                  
               
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                      U22-1 Listening and Understanding.mp3                  
               
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                      U22-2 Pronunciation.mp3                  
               
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                      U22-3 Pattern Practice.mp3                  
               
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                      U22-4 Listening.mp3                  
               
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                      U23-1 Listening and Understanding.mp3                  
               
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                      U23-2 Pronunciation.mp3                  
               
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                      U23-3 Pattern Practice.mp3                  
               
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                      U23-4 Listening.mp3                  
               
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                      U24-1 Listening and Understanding.mp3                  
               
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                      U24-2 Pronunciation.mp3                  
               
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                      U24-3 Pattern Practice.mp3                  
               
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                      U24-4 Listening.mp3                  
               
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                      U25-1 Listening and Understanding.mp3                  
               
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                      U25-2 Pronunciation.mp3                  
               
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                      U25-3 Pattern Practice.mp3                  
               
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                      U25-4 Listening.mp3                  
               
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                      U26-1 Listening and Understanding.mp3                  
               
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                      U26-2 Pronunciation.mp3                  
               
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                      U26-3 Pattern Practice.mp3                  
               
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                      U26-4 Listening.mp3                  
               
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                      U27-1 Listening and Understanding.mp3                  
               
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                      U27-2 Pronunciation.mp3                  
               
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                      U27-3 Pattern Practice.mp3                  
               
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                      U27-4 Listening.mp3                  
               
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                      U28-1 Listening and Understanding.mp3                  
               
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                      U28-2 Pronunciation.mp3                  
               
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                      U28-3 Pattern Practice.mp3                  
               
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                      U28-4 Listening.mp3                  
               
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                      U29-1 Listening and Understanding.mp3                  
               
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                      U29-2 Pronunciation.mp3                  
               
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                      U29-3 Pattern Practice.mp3                  
               
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                      U29-4 Listening.mp3                  
               
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                      U30-1 Listening and Understanding.mp3                  
               
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                      U30-2 Pronunciation.mp3                  
               
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                      U30-3 Pattern Practice.mp3                  
               
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                      U30-4 Listening.mp3                  
               
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                      U30-5 APPENDIX.mp3                  
               
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