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my %hash;
$hash{A}{A} = 1;
...
foreach my $k (keys %{$hash{B}}) {
    print "$k - $hash{B}{$k}\n";
}

#include <map>
#include <string>
...
        cout << i->first << " - " << i->second << "\n";
    }
}

using System;
using System.Collections.Generic;
...
        }
    }
}

my %hash;
%hash{"A"}{"A"} = 1;
...
for %hash{"B"}.kv -> $key, $value { 
    say "$key - $value" 
}

using System;
using System.Collections.Generic;
...
        }
    }
}