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  DB<1> use charnames qw(greek)

...
Use of uninitialized value $txt in pattern match (m//) at /usr/opt/per
+l5/lib/5.20.1/_charnames.pm line 459.
 [...]
Unknown charname 'greek:alpha' at (eval 11)[/usr/opt/perl5/lib/5.20.1/
+perl5db.pl:732] line 2, within string

 DB<1> use charnames qw(greek)

...
 DB<4> print "\N{greek:alpha}"
 Wide character in print at (eval 10)[/usr/share/perl/5.18/perl5db.pl:
+732] line 2.
 &#945;