Transparent staircase

I claim the ornamental design for a transparent staircase, as shown and described.

FIG. 1 is a perspective view of a transparent staircase showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a right side elevational view thereof, the left side elevational view being a mirror image thereof.

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