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+# -*- mode: org; -*-
+
+#+TITLE: Morse code
+#+SUBTITLE: The longest-lived telecommunication coding system.
+#+AUTHOR: Marius Peter
+#+DATE: <2022-04-05 Tue>
+
+#+DESCRIPTION: Morse code: the longest-lived telecommunication coding system.
+
+
+#+begin_abstract
+
+#+end_abstract
+
+
+* International Morse code
+
+Rules:
+
+1. A dash should last for three dots.
+2. The delay between:
+   1. two symbols is one dot,
+   2. two letters is three dots,
+   3. two words is seven points.
+      
+| Symbol | Coding  |
+|--------+---------|
+| A      | =·-=    |
+| B      | =-···=  |
+| C      | =-·-·=  |
+| D      | =-··=   |
+| E      | =·=     |
+| F      | =··-·=  |
+| G      | =--·=   |
+| H      | =····=  |
+| I      | =··=    |
+| J      | =·---=  |
+| K      | =-·-=   |
+| L      | =·-··=  |
+| M      | =--=    |
+| N      | =-·=    |
+| O      | =---=   |
+| P      | =·--·=  |
+| Q      | =--·-=  |
+| R      | =·-·=   |
+| S      | =···=   |
+| T      | =-=     |
+| U      | =··-=   |
+| V      | =···-=  |
+| W      | =·--=   |
+| X      | =-··-=  |
+| Y      | =-·--=  |
+| Z      | =--··=  |
+|--------+---------|
+| 1      | =·----= |
+| 2      | =··---= |
+| 3      | =···--= |
+| 4      | =····-= |
+| 5      | =·····= |
+| 6      | =-····= |
+| 7      | =--···= |
+| 8      | =---··= |
+| 9      | =----·= |
+| 0      | =-----= |