Two segments of 50 cm. 4 segments of 25 cm. Alpha Limit 8 12.5 cm segments.
Do not forget the basic rule Carpenter "Measure twice, cut only". That is, double check measurements before cutting, use a marker if necessary. And please avoid cut off a finger, they are really useful to grab parallettes.
With these segments, adding elbows, joints "T" and plugs have something for every parallette.