http://www.sec.gov/Archives/edgar/data/885725/000104746918001017/a2234627z424b2.htm
http://www.sec.gov/Archives/edgar/data/1045520/000110465918011544/a18-5112_29424b2.htm
http://www.sec.gov/Archives/edgar/data/1000275/000114036118009688/form424b2.htm
http://www.sec.gov/Archives/edgar/data/1000275/000114036118009783/form424b2.htm
http://www.sec.gov/Archives/edgar/data/83246/000114420418010443/tv486864_424b2.htm
http://www.sec.gov/Archives/edgar/data/1414475/000119312518054492/d541335d424b2.htm
http://www.sec.gov/Archives/edgar/data/722803/000119312518055656/d504184d424b5.htm
http://www.sec.gov/Archives/edgar/data/1729757/000119312518055783/d540291d424b5.htm
http://www.sec.gov/Archives/edgar/data/1139552/000119312518055963/d510817d424b5.htm
http://www.sec.gov/Archives/edgar/data/1692819/000169281918000013/vistra-022018x424b3.htm