<!ENTITY mathphrase.synopsis.gen SYSTEM "synopsis.e.gen">
<!ENTITY mathphrase.children.gen SYSTEM "children.gen">
<!ENTITY mathphrase.parents.gen SYSTEM "parents.gen">
<!ENTITY mathphrase.example.1.gen SYSTEM "example.1.gen">
<!ENTITY mathphrase.example.1.txt SYSTEM "example.1.txt">
