Sequence1=

**(all existing 4-digit numbers,**no leading zeros);

Sequence2= (each member of seq1 replaced by

**1**iff fulfilling

**both conditions : cond1 and cond2; replaced by**

**0**otherwise.)Cond1:

**k**(the number of letters in the English set of words representing

**N**) is even.

For example the number

**3024**(three thousand twenty four) does not qualify (23 letters) .

Cond2: the number

**N**is evenly divisible by

**3**, e.g. the number

**3024**qualifies.

Ergo:

**3024**of Sequence1 will be replaced by

**0**in Sequence2.

Denote by

**N**the number of ones in the seq2 and by

_{1}**N**the number of zeroes in that sequence.

_{0}Don't be intimidated by the D4 label,- reread the text carefully and try to answer all of the following questions:

a. What does the

**RH**stand for?

b. Is it true that

**abs(N**is an even number?

_{1}- N_{0})c. What is the meaning of

**KISS**?

d. Why

**D4**?