When two noun phrases are viewed as a single product like this, they almost always manifest in a fixed get. One example is, you talk about your knife and fork, not your 'fork and knife'. Whenever we talk or publish quantities, we use and also to individual hundred, thousand, million https://geschaftsstrom.de/sip-trunk-voip-handy-und-softphone-die-evolution-der-voip-telefonanlagen/