8. Where a SIPS operator supplements the resources referred to in paragraph 4 with other assets, these assets shall be likely to be marketable or acceptable as collateral (for, e.g. lines of credit, swaps, or repos) on an ad hoc basis following a default, even if this cannot be reliably prearranged or guaranteed under extreme but plausible market conditions. Where a participant supplements the resources referred to in paragraph 4 with other assets, the SIPS operator shall ensure that these other assets meet the requirements set out in the first sentence of this paragraph. Assets shall be presumed to be likely to be marketable or acceptable as collateral if the SIPS operator has taken into account the rules and practices of the relevant central bank on the eligibility of collateral.