Clarifying 'cec' and 'dsec' usage message.

src/base/abci/abc.c

@@ -20539,7 +20539,7 @@ usage:
     Abc_Print( -2, "\t-P num : partition size for multi-output networks [default = %s]\n", Buffer );
     Abc_Print( -2, "\t-p     : toggle automatic partitioning [default = %s]\n", fPartition? "yes": "no" );
     Abc_Print( -2, "\t-s     : toggle \"SAT only\" and \"FRAIG + SAT\" [default = %s]\n", fSat? "SAT only": "FRAIG + SAT" );
-    Abc_Print( -2, "\t-n     : toggle ignoring names when matching CIs/COs [default = %s]\n", fIgnoreNames? "yes": "no" );
+    Abc_Print( -2, "\t-n     : toggle how CIs/COs are matched (by name or by order) [default = %s]\n", fIgnoreNames? "by order": "by name" );
     Abc_Print( -2, "\t-v     : toggle verbose output [default = %s]\n", fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h     : print the command usage\n");
     Abc_Print( -2, "\tfile1  : (optional) the file with the first network\n");
@@ -20832,7 +20832,7 @@ usage:
     Abc_Print( -2, "\t-r     : toggles forward retiming at the beginning [default = %s]\n", pSecPar->fRetimeFirst? "yes": "no" );
     Abc_Print( -2, "\t-m     : toggles min-register retiming [default = %s]\n", pSecPar->fRetimeRegs? "yes": "no" );
     Abc_Print( -2, "\t-f     : toggles the internal use of fraiging [default = %s]\n", pSecPar->fFraiging? "yes": "no" );
-    Abc_Print( -2, "\t-n     : toggle ignoring names when matching PIs/POs [default = %s]\n", fIgnoreNames? "yes": "no" );
+    Abc_Print( -2, "\t-n     : toggle how CIs/COs are matched (by name or by order) [default = %s]\n", fIgnoreNames? "by order": "by name" );
     Abc_Print( -2, "\t-v     : toggles verbose output [default = %s]\n", pSecPar->fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-w     : toggles additional verbose output [default = %s]\n", pSecPar->fVeryVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h     : print the command usage\n");