Figure 3

Stair-climbing process of LEVO. Software used for this figure: Microsoft PowerPoint Microsoft 365 MSO (Version 2209 Build 16.0.15629.20200) 64-Bit (https://www.microsoft.com/en-us/microsoft-365/powerpoint), Autodesk Inventor 2023.1.1 (https://www.autodesk.com/products/inventor/overview?term=1-YEAR &tab=subscription).