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Changes up to # 75036530b621 +1 touching docs/guide.md · 12

See as swimlanes (independent work side by side)

75036530b62161b517e759e8319fc1fdc21e45d9e62e1d01ab78b8ffc0673ba2+b0abd4a7470876bf8d67f182c2207f7a7f79898a17def2e75a906e075e2aa1d5 has 2 heads. The graph shows their union; heads are marked.