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Syntax:  flat_sequence(s)

Description:  Returns TRUE (1) if, and only if, s is a sequence that contains only atoms. 
Status:  PROPOSED 
Syntax:  non_empty(s)

Description:  Returns TRUE (1) if, and only if, s is a sequence that is not empty. 
Status:  PROPOSED 
Syntax:  pair(s)

Description:  Returns TRUE (1) if, and only if, s is a sequence that contains only two elements. 
Status:  PROPOSED 