Mermaid Packet Diagram with MAIDR

Each row of 32 bits is a lane, down moving to the row drawn below and up back; left and right walk its fields, each announcing its bits and width.

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---
title: "UDP packet"
---
packet
0-15: "Source port"
16-31: "Destination port"
32-47: "Length"
48-63: "Checksum"
64-95: "Data (variable length)"