this is a question.

for initial values, for 40 bits, 1024 values ​​(domestic and wild, i.e. 2048) are enough. 3 seconds on PYTHON! PK found.

for 135 bits, only 134,217,728 (*2 for all kangaroos).

the question is how does the kangaroo work.

you need to understand that a private key is a set of random bits. the average statistical distribution assumes from 40% to 60% of ones and zeros (the minimum condition) in the private key in bit representation: i.e. two values ​​- domestic and wild kangaroo - should give in difference a number in which there should be a statistically normal distribution of bits.

Thus, one can initially select the most reliable values ​​for "manual" and "wild" that will guaranted assume the result of the most possible private key.