There is no clue for Mission Training, it's just to tell you what things you might come across in other missions.
There is mission 0 which would be the first mission but there is also mission 1. mission 0 clue=uranium(which is clue#11) mission 1 clue=phosphorus(which is clue#13) You can not enter clues by the way. You have to do the combos or missions.
Jane4
Google it. Youtube.
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the answer is LUKE1
Jane4
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If your talking about mission 0 then it is luke1
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Luke4
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