Update 'Square'

Square

@@ -4,3 +4,16 @@ Liquids  λ, μ, ν, and ρ
 Mutes  β, γ, δ, θ, κ, π, τ, φ, and χ
 
 Sibilants  σ, ζ, ξ, and ψ
+
+Square of Stops
+Guttural   κ   γ   χ
+Labial     π   β   φ
+Dental     τ   δ   θ
+
+When σ, μ, τ, or θ are joined with the consonants in the "Square of Stops", they are changed into to other consonants
+as shown in the chart below.
+	            	    +	=	+   =	+   =   +   =
+Guttural	κ	γ	χ	σ	ξ	μ   γ	τ   k   θ   χ
+Labial	    π	β	φ	σ	ψ	μ   μ   τ   π   θ   φ	
+Dental	    τ	δ	θ	σ	σ	μ   σ   τ   σ   θ   σ   before κ are dropped
+