In 2006 how many surface combat vessels and landing craft did the Oman navy have?
return the  Oman navy ;return surface combat vessels of #1 ;return landing craft of #1 ;return #2 in  2006 ;return #3 in  2006 ;return number of  #4 ;return number of  #5 ;return the  sum of #6 and  #7
['select', 'project', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']