set_part("1","Brest -> Paris;")// delete this cell if you define your dot_fragment literally (without computation)
set_part("2","Paris -> München")// delete this cell if you define your dot_fragment literally (without computation)
compute_dot_fragment=()=>newArray(...parts).map(e=>show_parts.includes(e[0])?e[1]:"").join(" ")// you can define your dot_fragment also literally in this cell
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