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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