I think Rod’s solution probably sorted you out already, but i think you could easily do it in Corel as well, anyway here it goes for future reference, you just need to set your duplicate distance previously to the size of your object + 2mm, and then use control+D to duplicate it as many times as you need. Sounds like what you asked was exactly not to duplicate but i would do it this way, afetr all you just need to set the duplicate distance once and then press Control and without releasing it press 49 times D key. If you use the aligner i think you would have to count it anyway.
Just my 2 cents. 😕
Britchenko