Bottom top diagram.
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A-->B B-->C B-->D C-->D
https://p101007003-dot-nitokucom.uc.r.appspot.com/frame/@nitoku.public/bottomTop?tk=pu&us=pu
bottomTop diagram syntax
https://p101007003-dot-nitokucom.uc.r.appspot.com/frame/@nitoku.design/license?tk=pu&us=pu