THESE? MAGNETIC? SYSTEM? ARE? DIFFICULT? TO REPRODUCE
the mag? have? to? be? in? the? exact position for? his polarity? ?orientation
if? you? mark? both? mag? for? the? orientation?
no problemo?
you? can? made a system? like this? by? position? the mag? in a? special? position? only?
when? you? turn? one? ?the mage? incrise? ? in? the? other possition? the mag? in NUL
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