The PDMS molds were prepared by soft lithography. To make master molds, an SU-8 100 (MicroChem) was spin-coated on plasma-treated silicon water at 1000 rpm, which resulted in a 250-μm-thick layer after prebaking. The SU-8 film was subjected to photolithography with photomasks with transparent windows of triangular, square, pentagonal, and hexagonal shapes. The lateral dimensions of the polygons were 230, 150, 120, and 100 μm, respectively. Resulting polygonal pillars were replicated to polygonal holes in PDMS by pouring and curing the mixture of a PDMS prepolymer (Slygard 184, Dow Corning) and cross-linker in a 10:1 weight ratio on them.

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