It does not matter whether the words are repeated or not, because the attacker will need the same amount of effort in both cases.
The important thing is the initial/first word order, but you don't have to worry.
I did not remember that someone reported about two words that were repeated so it might have been a Coinomi bug.
1-((2048!)/(2048^18*(2048-18)!))
The important thing is the initial/first word order, but you don't have to worry.
I did not remember that someone reported about two words that were repeated so it might have been a Coinomi bug.
There are no rules against the same word appearing twice in a seed phrase, and nothing in the BIP39 code to stop it from happening. On average, about one in every eight (12.65% to be precise) 24 word seed phrases generated will have a duplicate word. It's a bit more uncommon for them to be next to each other, but certainly not astronomical nor impossible.
1-((2048!)/(2048^18*(2048-18)!))