As it says on the package: start with 0,9l water, add 1 (one!) bag part A, stirr, add 1 (one!) bag part B, stirr ad fill up to 1l. This is the stock solution, which can be reused. Alternatively the stock solution can be further diluted (just before use) and used as one shot developer.
The package should contain 2 parts A and two parts B resulting in 2x1l stock solution.
A few weeks ago Adox had to change the packaging due to EU laws and Atomal 49 now comes with three bags and new instructions for mixing. According to Adox the Stock solution has the same active ingredients.