However, in the concrete embodiment selected here, the module width MB is variable, which is ensured with {HEAD ~ BX} according to {TAIL ~ variable intermediate pieces} 
according to
However , in the concrete embodiment selected here , the module width MB is variable , which is ensured with { HEAD ~ BX } according to { TAIL ~ variable intermediate pieces }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL