3. A method according to claim 1 wherein the step of processing comprises the step of reading out, from said textual block identifiers in a table, the texual block identifiers which correspond to each equivalent word which is determined in the step of determining.
3. A method according to claim 1 wherein the step of processing comprises the step of reading out, from said textual block identifiers in a table, the texual block identifiers which correspond to each equivalent word which is determined in the step of determining. 4. A method according to claim 3 wherein the step of processing further comprises the step of performing at least one merge sort on representations of the textual block identifiers which are read out in the step of processing.