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#!/usr/bin/perl
use strict;
...
A B (C (D E) (F G)) (H I)
A B (C (D E) (F G)) (H I) J
A B (C (D E) (F G)) (H I) J K

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A
A---B
...
A---B---C (D E) (F G)---H I
A---B---C (D E) (F G)---H I---J
A---B---C (D E) (F G)---H I---J---K