522. Exemptions

(f)(1) Notwithstanding any waiver of exemptions but subject to paragraph (3), the debtor may avoid the fixing of a lien on an interest of the debtor in property to the extent that such lien impairs an exemption to which the debtor would have been entitled under subsection (b) of this section, if such lien is--

(A) a judicial lien, [except certain judical liens securing debts for spousal or child support] . . . 

(B) a nonpossessory, nonpurchase-money security interest in any--

(i) household furnishings, household goods, wearing apparel, appliances, books, animals, crops, musical instruments, or jewelry that are held primarily for the personal, family, or household use of the debtor or a dependent of the debtor;

(ii) implements, professional books, or tools, of the trade of the debtor or the trade of a dependent of the debtor; or

(iii) professionally prescribed health aids for the debtor or a dependent of the debtor.

(2) (A) For the purposes of this subsection, a lien shall be considered to impair an exemption to the extent that the sum of--

(i) the lien;

(ii) all other liens on the property; and

(iii) the amount of the exemption that the debtor could claim if there were no liens on the property; exceeds the value that the debtor's interest in the property would have in the absence of any liens.

* * *