Ping TangPing Tang 35322 Gold badges66 silver badges1515 bronze badges 1 1 "A single" attracts additional notice to this particular function, when also suggesting that you would possibly (or providing you with the option to) explore other characteristics later. To paraphrase, a single helps make the element "additional Unique". Também https://vodemcasa.com/one-tv-p2p-plano-semestral