How many minutes of a half-life does the unconfirmed 286Rg and 283Rg appear to have combined?
return half-lives ;return #1 of 286Rg ;return minutes of #2 ;return #1 of 283Rg ;return minutes of #4 ;return sum of #3 and  #5
['select', 'filter', 'project', 'filter', 'project', 'arithmetic']