3
TOP -> {rank=same a b c d e f } -> BOTTOM
4
b [shape=record, label="<left>left |{<up>up | <middle>middle | <down>down } | right"]
6
label=<<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" CELLBORDER="1">
8
<TD PORT="htmlleft">LEFT</TD>
11
<TABLE PORT="inner" BORDER="0" CELLPADDING="0" CELLSPACING="0" CELLBORDER="1">
12
<TR><TD>RIGHTTOP</TD></TR>
13
<TR><TD>RIGHTBOTTOM</TD></TR>