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"Can't use string ("a") as a subroutine ref while "strict refs" in use
+ at line [eval { $result .= &{$_}(@time); };]"

my %method_map = (a => sub { ... }, A => sub { ... } );
my $token = 'a'; # or 'A', 'D', etc.
my $result .= $method_map{$token}->(@args);