main - principal / 1E1 ( one / two / three ) :: 1E2 ( one / two / three ) :: 1E3a ( one / two / three / four ) :: 1E3b ( one / two / three ) :: 1E4 ( one / two / three ) :: CL2A / NGR ( ochre - ocre / red brown - castaño rojo ( one / two / three ) / rust brown - castaño rumbriento ) / 2C ( horizontal - vertical ) / NOP / 1L2 / 1L6 / difficult to type - dificiles de calsificar