% E = {A,B,…,R} and F represent events
	% S represents a sample
For each E in S	% Analysis done for each combination
F ← E union {X = 0}	% Select control combinations, X = 0
f0[E] ← count(F)	% Count of Controls
Y0[E] ← sum(y(F))/count(F)	% Prob Y for Controls
For each E in S	% Analysis done for each combination
F ← E union {X = 1}	% Select Case combinations, X = 1
f1[E] ← count(F)	% Count of Cases
Y1[E] ← sum(y(F))/count(F)	% Prob Y for Cases
For each E in f0	% Weights for Control combinations
if E in f1
then w0[E] ← f1[E]/f0[E]	% Matched
else w0[E] ← 0	% Not matched
For each E in f1	% Weights for Case combinations
if E in f0
then w1[E] ← 1	% Matched
else w1[E] ← 0	% Not matched