It depends on your language proficiency and reading habits. If it's in a language you're not familiar with, it could be challenging. But if you're used to the writing style and genre of the novel, it might be easy.
I don't think'mang patra' is a familiar phrase in English. It could be a unique or rare word from a particular language or field. Without further information, it's hard to determine its meaning precisely.
I've never come across the word 'mang' in standard English. It could potentially be a local or dialectal term, or maybe a made-up word. Do you have any more context to help figure it out?