{TAIL ~ An arch} 40 is formed in the fold of {HEAD ~ panels} 36 and 38 so as to create a downward biasing force on flaps 36 and 38, which holds flaps 36 and 38 in contact with base 32  
{ TAIL ~ An arch } 40 is formed in the fold of { HEAD ~ panels } 36 and 38 so as to create a downward biasing force on flaps 36 and 38 , which holds flaps 36 and 38 in contact with base 32
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