How many men on the 6th floor and how many shots were fired. (English Version)

Many witnesses saw more than one man on the 6th floor of the Texas School Book Depository and several heard more than three shots.
Velma, 85 years old, telling about seeing a gunman running out of the TSBD. Neither his appearance nor gun matched that of Lee Harvey Oswald's. She kept quiet for many years to protect her family.
(The assassination of President John f. Kennedy, Dallas, Texas, November 22, 1963)