Maple 6
 
 
work1 work2-1   work2-2 work3 work4-1    work4-2
work5 work6-1   work6-2 work7-1   work7-2 work8-1    work8-2  
work9-1    work9-2 work10 work11-1     work11-2 work12-1  work12-2
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