kˈɑːmɪk ɹˈiːdɚz kʊd sˈɛnd ɐwˈeɪ fɔːɹ ænd ɹᵻsˈiːv spˈɛʃəl mˈɛmbɚʃˌɪp kˈɑːɹdz ðæt ˈɔːlsoʊ dˈʌbəld æz dᵻkˈoʊdɚz.
Comic readers could send away for and receive special membership cards that also doubled as decoders.