u§ΜφΜ’EvΦίι
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Gallery of Height-Reversing Objects i³½]§ΜΜM[j
Simple SurfacsesiP\Κj
Towers ij
General Surfaces iκΚ\Κj
Jumping Roosters iςΡζι{j
Suspension Bridge and Arch Bridge iέθ΄ΖA[`΄j
