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- Morse code (33777 bytes)
1: [[Image:Morse_sam.jpg|250px|thumb|right|Portrait of Samuel F. B. Morse.Image provided by [http://c...
2: ...r, making it appropriate for sending automated digital data in voice channels.
4: ...s — on and off — it was an early form of a digital code. International Morse code is composed of s...
5: # short mark, dot or 'dit' (·)
7: ...intra-character gap (between the dots and dashes within a character) - Tangram (4661 bytes)
6: It consists of 7 pieces, called ''Tans'', which fit together to form a square:
11: The objective is to form a given shape with seven pieces.
14: ...thagorean theorem]] was discovered in the Orient with help of Tangram pieces.
35: *''Anno's Math Games'', Mitsumasa Anno, Philomel Books
37: *''Geometry and Fractions with Tangrams'', Barbara Bando Irvin
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