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Unua ekzemplo
Kodo
| \xymatrix{ | |
| | &{}&&&&&&&\\ |
| | b\ar@{.}[rrr]&&&{\bullet}\ar@{.}[rrrr]^<{M_1}&&{}&&{}&\\ |
| | &&&&&&&&\\ |
| | 0\ar'[rrrrrrrr]^</1.5cm/{M_0}_</1.4cm/{0}_</3.7cm/{a/3}_>/-3cm/{2a/3}^>/-1cm/{M_3}&{\bullet}&&&&&&{\bullet}&{}\\ |
| | &&&&&&&&\\ |
| | -b\ar@{.}[rrrrr]&&&{}\ar@{.}[uuuu]&&{\bullet}\ar@{.}[uuuu]\ar@{.}[rr]_<{M_2}&&{}&\\ |
| | &{}\ar[uuuuuu]&&&&&&& |
| } | |
Rezulto

Skemo

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