A hash corresponding to a bit string is generated. The hash corresponds to an address location in a data structure associated with the bit string. An index and a modifier correspond to the address location in the data structure corresponding to the hash associated with a first address location in the data structure are determined. In response to determining that the modifier has a first value associated therewith, index information corresponding to the bit string is written to the first address location in the data structure. In response to determining that the modifier has a second value other than the first value associated therewith, the index information corresponding to the bit string is written to a second address location in the data structure.