Lesson over 6.1: https://drive.google.com/file/d/1dGYHVmCd2TJH_3zCdc18xwWYXb3DYTqA/view
Lesson over 6.2 part 1: https://drive.google.com/file/d/1CuDx--FRUskVK5xKJXwtTATXTuu_3gI9/view
Lesson over 6.2 part 2: https://drive.google.com/file/d/1lNYgS0zEfjUlqk1rZ8Apx1zndorBsRkd/view
Lesson over 6.3: https://drive.google.com/file/d/1x5O6BWlR78DyrKrL3ZkOw7vpypxZPvZi/view
Lesson over 6.4: https://drive.google.com/file/d/1Zp_jUuDcHRskUT1ANjI7jxsG-GEp1ABp/view
Lesson over 6.5: https://drive.google.com/file/d/1Z2QK96N6DODo0P7wTCSADzMjiOpNSsK1/view
Lesson over 6.6: https://drive.google.com/file/d/1xaKxokmryfVbW_h70zuRGIqhZ4uvvDv-/view