Crunch ignoring numbers when processing word charsets with -p or -q, is there any workaround?

I have an input.txt file with the following content:

abc
cba
bca

I'm genereating every possible combinations of these words with crunch:

$ crunch 3 6 -o output.txt -q input.txt

The generated output.txt looks like this:

abcbcacba
abccbabca
bcaabccba
bcacbaabc
cbaabcbca
cbabcaabc

However what I want to achieve is to print only the combinations which is between 3-6 characters in length. Crunch ignoring the numbers when you use -p or -q which is stated in the manpage.

Is there any workaround for this?