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The phrase "are often difficult to" is correct and usable in written English.
It can be used when discussing challenges or complexities associated with a particular subject or task.
Example: "These problems are often difficult to solve without proper guidance."
Alternatives: "are frequently hard to" or "can be challenging to".
Exact(60)
But they are often difficult to find.
Such systems are often difficult to solve.
DWMS are often difficult to fabricate, however.
These bugs are often difficult to find manually.
Fleet Street memoirs are often difficult to read without wincing.
Fragmentary seal impressions are often difficult to interpret.
They are often difficult to treat and recurrence is common.
Ectoparasites are often difficult to detect in the field.
Focal seizures are often difficult to treat, leading to pharmacoresistance.
Broad spatial distributions of discharging groundwater are often difficult to measure directly.
In their general form these criteria are often difficult to apply in practice.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com