pre_text: Unrecognized deferred tax assets Deferred tax assets have not been recognized in respect of the following items, given the volatile nature of the semi-conductor equipment industry. Therefore it is not probable that future taxable profit will be available to offset deductible temporary differences. 1 These credits regards R&D credits generated in the US, in the state of Arizona. However, ASMI does not recognize these credits stemming from prior years due to the fact that utilization of prior year credits is only possibly if and when the credits generated in the current year are fully utilized. Given the level of R&D activity in the US, the company does not expect it could fully utilize the credits generated in the current year and, hence, does not expect to benefit from the available credits generated in prior years.
table: 2019
table: Gross amount Tax effect
table: Deductible temporary differences 20,642 4,842
table: Credits 1) 15,221 15,221
table: Unrecognized deferred tax assets 35,863 20,063
question: Analyse this data from a financial earnings document. What is the difference in the gross amount of  Deductible temporary differences and Credits?