Sandbox

{{#sqform:

      {{#input: type = hidden | name = content | value = {{#sask: type = properties | [[Has mode::{{#sqvar:mode}}]] }} [[Has rhythm::{{#sqvar:rhythm}}]] }}}}

Has Mode:

{{#sask: ?Has mode|return = form}}

Has Rhythm:

{{#sask: ?Has rhythm|return = form}}

{{#sqinput: type = submit | value = List and save entries }} }}