Replicators generating basic COSY sequences are of two types:
Concatenators
which generate consecutive regularities are of the form:
and
Imbricators
which generate regularities nested within each other are of the form:
where p,t,q denote arbitrary strings of macro terminal symbols, and sep denotes the separators ``;'' or ``,''.
The non-terminal sreplicator producing sequence replicators is defined as follows:
where the non-terminals concseq and imbrseq produce the string
inside 
of concatenators and imbricators respectively, whose
syntax we give as follows:
R(1) and R(2) are examples of replicators according to rule M11 and R(3), R(4) and R(5) are examples of replicators according to rule M12.
