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+
+'format compact' => less syntax
+
+self assess:
+    C) 13x4
+    E) vertcat; different columns
+
+### julia notes:
+
+built-in types seem to default to just an array instead of, eg, 3x1 or 1x3.
+
+can transform with "'"; A'' != A?
+
+to vert/horiz cat, need to explicitly 
+
+julia> size([1,2,3])
+(3,)
+
+julia> size([1,2,3]')
+(1,3)
+
+julia> size([1,2,3]'')
+(3,1)
+