Add punctuation to the following sentence: 1Syrian government makes Aleppo advance in major attack 2Police search for gunman who killed five at mall in Washington state 3Obama vetoes Sept 11 Saudi bill sets up showdown with Congress 4Clinton leads Trump by 4 points ahead of first presidential debate ReutersIpsos poll 5SpaceX blast investigation suggests breach in oxygen tanks helium system
1Syrian government makes Aleppo advance in major attack 2Police search for gunman who killed five at mall in Washington state 3Obama vetoes Sept. 11 Saudi bill, sets up showdown with Congress 4Clinton leads Trump by 4 points ahead of first presidential debate: Reuters/Ipsos poll 5SpaceX blast investigation suggests breach in oxygen tank's helium system