function b = sAND(varargin)
b = true;
for k = 1:numel(varargin)
if ~varargin{k}();
b = false;
return;
end
end
end
function b = sOR(varargin)
b = false;
for k = 1:numel(varargin)
if varargin{k}();
b = true;
return;
end
end
end
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