Chitoliro ndi cholumikizira cholumikizidwa ndi chitoliro chachitsulo chomwe chimatha kupukutidwa chomwe chimalumikiza mapaipi atatu okhala ndi mainchesi ofanana, zomwe zimathandiza kuti mapaipi azizungulira 90° kapena 180°.
Chitoliro ndi cholumikizira cholumikizidwa ndi chitoliro chachitsulo chomwe chimatha kupukutidwa chomwe chimalumikiza mapaipi atatu okhala ndi mainchesi ofanana, zomwe zimathandiza kuti mapaipi azizungulira 90° kapena 180°.
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