OPENQASM 2.0;
include "qelib1.inc";
qreg bits[4];
h bits[0];
cx bits[1], bits[0];
cx bits[2], bits[1];
cx bits[3], bits[2];
OPENQASM 2.0;
include "qelib1.inc";
qreg bits[4];
h bits[0];
cx bits[1], bits[0];
cx bits[2], bits[1];
cx bits[3], bits[2];