Indeed - but I suppose one could say that if they actually do explicitly say "OR", then there is clearly not a requirement to comply with A and B and C. I think that the basis of mfarrow's' problem' was probably that the regs do not say explicitly that one can comply directly with 525.100 (by engineering argument) OR, if one prefers, use the deemed-to-satsify provision in Appendix 4.
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