I'm not sure if this is on-topic here. If I get reasonable amount of comments telling that it's off-topic, I'll delete my post.

I wrote a code that generates random human-readable strings. Every other letter is vowel, and in some random places there are two consecutive vowels or two consecutive consonants; pretty simple algorithm.

I showed it to a friend and he told me that most of the resulting strings sound like they're Chinese or Japanese words.

My question is that what makes languages like Korean, Chinese, or Japanese sound different than European languages like English? What do they have in common that makes them different? Is there any special combination of letters?

Remark: In the title by "Asian languages" I mean languages like Chinese, Japanese, Korean, etc.

Edit: I myself speak western Persian, an Asian language. But when I hear Chinese, Japanese, or Korean, I'm like "this is an eastern asian language" . Those languages are different from each other and sound different, but many people around me have the same feeling as me when hearing those languages. The question is why it's like that?

I'm not sure if this is on-topic here. If I get reasonable amount of comments telling that it's off-topic, I'll delete my post.

I wrote a code that generates random human-readable strings. Every other letter is vowel, and in some random places there are two consecutive vowels or two consecutive consonants; pretty simple algorithm.

I showed it to a friend and he told me that most of the resulting strings sound like they're Chinese or Japanese words.

My question is that what makes languages like Korean, Chinese, or Japanese sound different than European languages like English? What do they have in common that makes them different? Is there any special combination of letters?

Edit: I myself speak western Persian, an Asian language. But when I hear Chinese, Japanese, or Korean, I'm like "this is an East-Asian language" . Those languages are different from each other and sound different, but many people around me have the same feeling as me when hearing those languages. The question is why it's like that?

Edit 2: Maybe "Why would someone categorize a word as East-Asian?" is better title, which is a vague and a wide topic. I accepted @Pace's answer because it gave me a better understanding and helped me more. But I think the other answer is a better answer to the question in the title.

I'm not sure if this is on-topic here. If I get reasonable amount of comments telling that it's off-topic, I'll delete my post.

I wrote a code that generates random human-readable strings. Every other letter is vowel, and in some random places there are two consecutive vowels or two consecutive consonants; pretty simple algorithm.

I showed it to a friend and he told me that most of the resulting strings sound like they're chinese or japanese words.

My question is that what makes languages like korean, chinese, or japanese sound different than european languages like English? What do they have in common that makes them different? Is there any special combination of letters?

Remark: In the title by "asian languages" I mean languages like Chinese, Japanese, Korean, etc.

Edit: I myself speak western Persian, an asian language. But when I hear Chinese, Japanese, or Korean, I'm like "this is an eastern asian language" . Those languages are different from each other and sound different, but many people around me have the same feeling as me when hearing those languages. The question is why it's like that?

I'm not sure if this is on-topic here. If I get reasonable amount of comments telling that it's off-topic, I'll delete my post.

I wrote a code that generates random human-readable strings. Every other letter is vowel, and in some random places there are two consecutive vowels or two consecutive consonants; pretty simple algorithm.

I showed it to a friend and he told me that most of the resulting strings sound like they're Chinese or Japanese words.

My question is that what makes languages like Korean, Chinese, or Japanese sound different than European languages like English? What do they have in common that makes them different? Is there any special combination of letters?

Remark: In the title by "Asian languages" I mean languages like Chinese, Japanese, Korean, etc.

Edit: I myself speak western Persian, an Asian language. But when I hear Chinese, Japanese, or Korean, I'm like "this is an eastern asian language" . Those languages are different from each other and sound different, but many people around me have the same feeling as me when hearing those languages. The question is why it's like that?