260920, 260921, 261701, 261704, 261705, 261708, 280105 - Squares inside one another. Squares that are completely or partially shaded. Straight line(s), band(s) or bar(s). Vertical line(s), band(s) or bar(s). Horizontal line(s), band(s) or bar(s). A single line, band, bar or diagonal. Inscriptions in Greek characters, including the following: Α α Β β Γ γ Δ δ Ε ε Ζ ζ Η η Θ θ Ι ι Κ κ Λ λ Μ μ Ν ν Ξ ξ Ο ο Π π Ρ ρ ς Σ σ Τ τ Υ υ Φ φ Χ χ Ψ ψ Ω ω.