digraph G {
 rankdir=LR
 node [shape=box, fontsize=9, height=0.1, width=0.05 ]
 edge [arrowsize=0.5, len=0.1]
"invitation\n"
"salutation_text\n"
"hour\n"
"greeting_text\n"
"gender\n"
"martial_status\n"
"age\n"
"salutation_text\n"->"invitation\n"
"hour\n"->"greeting_text\n"
"greeting_text\n"->"invitation\n"
"gender\n"->"salutation_text\n"
"martial_status\n"->"salutation_text\n"
"age\n"->"salutation_text\n"
}