The question requires filling in blanks in a sentence to ensure it makes logical sense. By analyzing the sentence, "Our Constitution is so simple and __________ that it is always possible to meet extraordinary needs by changes in emphasis and arrangement without loss of essential __________," we need words that describe a constitution that is adaptable yet retains its core essence.
Let's evaluate the options:
Among these, "practical ... form" aligns perfectly with the needs of a constitution that is adaptable while maintaining its essential structure.


For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: