━ Red line = New · ⩘⩘ Zig-zag = Remove · █ Red highlight = Concern / verify · ■ Green = Retained · ■ Black = Existing · ✓ Green tick = Good · ◯➜ Purple circle + arrow = move device · ● Dot = Terminal / junction · ⌒ Hop = Wires cross, not connected · ⚡ Symbols = RDH library devices (pen colour) · ⩘ REMOVE LINE n = remove that line · ┅ NEW LINE ➜ = insert a line (renumber to suit)