Stroke stroke order Tracing red description This children's learning to write Chinese characters Kindergarten 3-5-6 years old Small class Middle class Large class radical copybook Preschool children's connecting textbook Pencil writing practice book Stroke copying Early childhood Chinese writing practice book Stroke copying Early childhood Chinese writing practice book Stroke copying Early childhood Chinese writing practice book Stroke copying Early childhood Chinese writing practice book Stroke copying Early childhood Chinese writing practice book Stroke copying early childhood Chinese writing practice book Stroke copying early childhood Chinese writing practice book Stroke copying