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A photograph taken from behind a seated person in an orange garment, whose hand holds a teal marker over a sheet of paper covered with hand-drawn tree diagrams of nodes labelled T, S, D1 to D10 and L. A red book with partly visible text lies beside the paper on a wooden desk, with a stainless steel water flask wrapped in orange sleeve and a metal-rimmed stand on the right. Another person in white trousers is seated partly visible at the top. Dim warm lighting.