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Glide Reflections

Remember a glide reflection g involve the combination of a reflection in a mirror with a translation parallel to that mirror. But then the composition of g with itself (g2) will be a translation. By the above though, the translation distance must be a whole number of units ....

Where can this mirror be if the strip $-1 \leq y \leq 1 $ is to be transformed to itself?
Translation Part:
How many units can the translation part of the glide reflection be?