Derrivation suffixes in Gothic

[kevin.behrens@rocketmail.com]

Hey,
have you written that on your own? I really thank you! That's amazing. But some questions still remain. 
Are -arja and -and the only suffixes to mark an agent noun? And are they in a free variety or is -arja just for -jan verbes and the -and for all other verbs? 
It's pretty good to finally see a chart of the suffixes in gothic. But is there a certain rule, how these endings are divided? 
And how are those forms built as: "the making" etc.?
Thank you very much for so far! ;)
Liubos goleinins
Kevin

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