% this is a comment line
% sample input for P-system simulator

<SYMBOLS>
a
b
c
c'
e
</SYMBOLS>
% explanation: one symbol per line, no spaces allowed in symbol name

<STRUCTURE>
S: A B
A: C
</STRUCTURE>
% explanation:
% membrane structure: one line per membrane
% (skin) membrane S contains membranes A and B
% membrane A contains membrane C
% the first membrane mentioned (here: S) is assumed to be the skin


<RULES>
S: 
a b -> e[out]

A:
a c -> c a[out]

B:
c' b -> c' b[out]

C:
c -> c' c'[out]
c' -> 
</RULES>
% explanation:
% one section per membrane
% one rule per line
% "c' -> " means that c simply disappears

<INIT>
S:

A: 
300*a
c

B:
200*b

C:
2*c
</INIT>
% explanation:
% initial state
% one section per membrane
% one line per symbol, sequence may be arbitrary
% support use notation k*a for k copies of a, "a" = "1*a"

<TRACE>
S: a [a] [b]
B: [c'] [b]
C: c c'
</TRACE>
% explanation:
% one line per membrane
% [c] means that the concentration of c is reported,
%	the concentration is the fraction of symbols in the membranes
%	that are c's