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Oxf22197
@oxf22197
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0:44
The mathematics of folding a piece of paper-B_rM_c4k
7 years ago
0:44
How to draw a tangent to a circle from a point-WHym_d8
7 years ago
0:22
How to draw a pentagon-xUvJhWlwp
7 years ago
0:43
Key pad electronics demo-qU
7 years ago