User talk:2620:0:105F:315:F648:7C44:315E:CB71

Interpretation for 2 half-twists
Why undo the edit? The only way the result (of cutting a M strip along the center) can be described as having two half-twists is if the M strip itself is considered to have half of a half-twist. @David Eppstein 2620:0:105F:315:5A60:B204:19CE:910 (talk) 08:49, 20 December 2022 (UTC)