Note: why do I ask if sections ever repeated, because removal of sections as coding error implies assembling document from parts which strikes me weird here but

Note: why do I ask if sections ever repeated, because removal of sections as coding error implies assembling document from parts which strikes me weird here but OK it is a common document pattern also, maybe someone thought it was a clever idea at the time. But if you assemble documents you have two common types of bugs: missing parts of document bugs and parts of document repeating bugs.