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strict digraph sbox4 {
x0 [shape=box, label="\N"];
x1 [shape=box, label="\N"];
x2 [shape=box, label="\N"];
x3 [shape=box, label="\N"];
t02 [label="\N\ny2\n1"];
t01 [label="\N\ny3\n2"];
t03 [label="\N\ny2\n3"];
t06 [label="\N\ny3\n4"];
t04 [label="\N\ny0\n5"];
t05 [label="\N\nx3\n6"];
t15 [label="\N\nx0\n7"];
t11 [label="\N\nx1\n8"];
t10 [label="\N\nx2\n9"];
y3 [shape=box, label="\N\n10"];
t13 [label="\N\ny2\n11"];
t08 [label="\N\ny1\n12"];
y2 [shape=box, label="\N\n13"];
t12 [label="\N\ny1\n14"];
t16 [label="\N\ny1\n15"];
y1 [shape=box, label="\N\n16"];
t09 [label="\N\ny0\n17"];
t14 [label="\N\ny0\n18"];
y0 [shape=box, label="\N\n19"];
x0 -> t01; x1 -> t01; // t01 = x0 | x1;
x1 -> t02; x2 -> t02; // t02 = x1 | x2;
x0 -> t03; t02 -> t03; // t03 = x0 ^ t02;
x1 -> t04; x3 -> t04; // t04 = x1 ^ x3;
x3 -> t05; t03 -> t05; // t05 = x3 | t03;
x3 -> t06; t01 -> t06; // t06 = x3 & t01;
t03 -> y3; t06 -> y3; // y3 = t03 ^ t06;
y3 -> t08; t04 -> t08; // t08 = y3 & t04;
t04 -> t09; t05 -> t09; // t09 = t04 & t05;
x2 -> t10; t06 -> t10; // t10 = x2 ^ t06;
x1 -> t11; x2 -> t11; // t11 = x1 & x2;
t04 -> t12; t08 -> t12; // t12 = t04 ^ t08;
t11 -> t13; t03 -> t13; // t13 = t11 | t03;
t10 -> t14; t09 -> t14; // t14 = t10 ^ t09;
x0 -> t15; t05 -> t15; // t15 = x0 & t05;
t11 -> t16; t12 -> t16; // t16 = t11 | t12;
t13 -> y2; t08 -> y2; // y2 = t13 ^ t08;
t15 -> y1; t16 -> y1; // y1 = t15 ^ t16;
t14 -> y0; // y0 = ~ t14;
}
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