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I had trouble finding out the answer _____ the question.

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to carry out    carrying out    carried out    with carrying out  
finding    to find    found    for finding  
finding  to find   found  to have been finding  
typical  complete  clean  clear  
set; are needed    put; need    sorted; are needed    written; need  
to find  for finding  finding  with finding  
to find    of finding    finding    about finding  
leading;finding;leading   to lead;found;to lead   led;finding;led   leading;found;led  
finding  looking for  finding out  looking up  
typical  complete  clean  clear  
to find   finding   found   for finding  
no difficulties finding   not trouble in finding   no difficulty to find   no difficulty finding  
leading; finding    to lead; found    led; finding    leading; to find  
to have found    with finding    finding    to find  
has found    was finding    had found    would find  
typical  complete  clean  clear  
finding    finding out    looking for    looking up  
finding out  that  lay in  in the mountains  
to lead    had led    led    leading  

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