pseudo-randomized trial sequence in advance by code

Hello!!

I am new to psytoolkit.

i am designing an experiment where 

i need trials in a random order but with some constraints 

there are two type of trials

for example in set of 48 trials 

typeA = 12 trials 
typeB = 36 trials

in typeA trials there are four type of conditions, 
typeA1
typeA2
typeA3
typeA4





and each has three which makes total 12 trials:
typeA11

typeA12

typeA13



typeA21

typeA22

typeA23





typeA31

typeA32

typeA33



typeA41

typeA42

typeA43





i need these 12 trials come randomly with 36 trials as, experiment never start with typeA and end with typeA type trials. no typeA trials repetition.  and also no repetition of typeA11, type21, type31, type41 and in similar way typeA12, typeA22, typeA32, type34..

Is this possible with this program?


is there any possibility where i can make a trial sequence in advance.
is there possibility to define a array or list variable?


Thanks in advance