Hi, line 500 (missing “hesis” in “parenthesis”): -\installmathfencepair ) \Rparentmirrored     ( \Lparentmirrored +\installmathfencepair ) \Rparenthesismirrored     ( \Lparenthesismirrored line 531(missing “al” in “interval”): -\installmathfencepair ⦗ \Linterv              ⦘ \Rinterv +\installmathfencepair ⦗ \Linterval              ⦘ \Rinterval Wolfgang