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The keyword or performs a logical operation which returns the value true if at least one of its operands is true; it returns the value false only if both operands are false.
Related keywords:
| or | 
Example 1:
const boolean c_gut := true;  
const boolean c_schlecht := false;  
var boolean v_zsammen := c_gut or c_schlecht; 
The varaible v_zsammen will have the initial value true.
BNF definition of or