The term 'to such an extent (as)' can be expressed in two different ways in a crossword puzzle. The first is 'insofar' which is seven letters long and the second is 'isofar' which is six letters long. Both words mean to the same degree or extent, and are often used to indicate a comparison between two things. Insofar is more commonly used in formal writing, while isofar is more commonly used in informal writing.