1. ‘I mean: this is simply what we do. This is use and custom among us, or a fact of our natural history’ (RFM, I, 63).
2. Cf. also RFM, II, 30 and V, 28.
3. A. Prior, ‘The Runabout Inference Ticket’, Analysis, vol.21, 1960, pp.38–9.
4. Cf. also RFM, V, 1–8.
5. N. Belnap, ‘Tonk, Plonk and Plink’, Analysis, vol.22, 1962, pp.130–34.