A B S construction

withdrawn
#10  (2019-06-20 10:48)
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#11  (2019-06-20 10:52)
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#17  (2019-06-20 11:20)
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#18  (2019-06-20 11:29)
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#19  (2019-06-20 11:45)
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#68  (2019-06-25 10:52)
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#77  (2019-06-27 07:00)
withdrawn
#78  (2019-06-27 07:22)