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The following functions are used for drupal module development.
You should change "hook" of function name to the module name you are creating.
* hook_menu()
* hook_user()
* hook_nodeapi()
* hook_install()
* hook_uninstall()
* hook_schema()
* hook_action_info()
* hook_block()
* hook_help()
* {form_function name}_submit($form, $form_state)
* {form_function_name}_validate($form, $form_state)
* drupal_get_form(%form name%)
* drupal_get_path('module','system')
* node_get_types('names') or ('page' => 'Page', 'story' => 'Story')
* variable_get(%variable_name%, %defaul%)
* variable_delete(%variable_name%)
* system_settings_form($form)