+ <widget class="GtkExpander" id="expander2">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <child>
+ <widget class="GtkVBox" id="vbox3">
+ <property name="visible">True</property>
+ <child>
+ <widget class="GtkButton" id="butImpl_elim">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Implication (⇒_e)</property>
+ <property name="response_id">0</property>
+ </widget>
+ </child>
+ <child>
+ <widget class="GtkButton" id="butAnd_elim_left">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Conjunction left (∧_e_l)</property>
+ <property name="response_id">0</property>
+ </widget>
+ <packing>
+ <property name="position">1</property>
+ </packing>
+ </child>
+ <child>
+ <widget class="GtkButton" id="butAnd_elim_right">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Conjunction right (∧_e_r)</property>
+ <property name="response_id">0</property>
+ </widget>
+ <packing>
+ <property name="position">2</property>
+ </packing>
+ </child>
+ <child>
+ <widget class="GtkButton" id="butOr_elim">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Disjunction (∨_e)</property>
+ <property name="response_id">0</property>
+ </widget>
+ <packing>
+ <property name="position">3</property>
+ </packing>
+ </child>
+ <child>
+ <widget class="GtkButton" id="butNot_elim">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Negation (¬_e)</property>
+ <property name="response_id">0</property>
+ </widget>
+ <packing>
+ <property name="position">4</property>
+ </packing>
+ </child>
+ <child>
+ <widget class="GtkButton" id="butBot_elim">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Bottom (⊥_e)</property>
+ <property name="response_id">0</property>
+ </widget>
+ <packing>
+ <property name="position">5</property>
+ </packing>
+ </child>
+ <child>
+ <widget class="GtkButton" id="butForall_elim">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Universal (∀_e)</property>
+ <property name="response_id">0</property>
+ </widget>
+ <packing>
+ <property name="position">6</property>
+ </packing>
+ </child>
+ <child>
+ <widget class="GtkButton" id="butExists_elim">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <property name="label" translatable="yes">Existential (∃_e)</property>
+ <property name="response_id">0</property>
+ </widget>
+ <packing>
+ <property name="position">7</property>
+ </packing>
+ </child>
+ </widget>
+ </child>
+ <child>
+ <widget class="GtkLabel" id="label5">
+ <property name="visible">True</property>
+ <property name="label" translatable="yes">Elimination rules</property>
+ </widget>
+ <packing>
+ <property name="type">label_item</property>
+ </packing>
+ </child>
+ </widget>
+ <packing>
+ <property name="expand">False</property>
+ <property name="position">1</property>
+ </packing>