Gather the pick key's load and render sides in pick.go, and name each thing for what it is

list.go

@@ -62,43 +62,3 @@ func tablePaths(t *table, intoRepeats bool) []string {
 	}
 	return out
 }
-
-// sharedPaths is the sub-paths every item carries — the only ones a path may step
-// through a choice to reach. It intersects, bailing as soon as the set
-// is empty, which is immediate for a choice of plain strings.
-func sharedPaths(items []node, intoRepeats bool) map[string]bool {
-	shared := subPaths(items[0], intoRepeats)
-	for _, it := range items[1:] {
-		if len(shared) == 0 {
-			return nil
-		}
-		next := subPaths(it, intoRepeats)
-		for p := range shared {
-			if !next[p] {
-				delete(shared, p)
-			}
-		}
-	}
-	return shared
-}
-
-// subPaths is paths(n, intoRepeats) as a set, without the empty path that means n itself.
-func subPaths(n node, intoRepeats bool) map[string]bool {
-	out := map[string]bool{}
-	for _, p := range paths(n, intoRepeats) {
-		if p != "" {
-			out[p] = true
-		}
-	}
-	return out
-}
-
-func join(prefix, name string) string {
-	switch {
-	case prefix == "":
-		return name
-	case name == "":
-		return prefix
-	}
-	return prefix + "." + name
-}