Randomisation in a parametric block design

[avantika mathur]

Hi!

I have different question to ask regarding randomization of stimulus. I am 
trying to make a parametric block design experiment. Within this type of 
experiment  within a run, stimulus A1 in block 1  has to be followed by 
stimulus A2 in block 2. So if following is the order of blocks:

block1 - stimulus A1 ;  block2 - stimulus A2; 
 block3 - stimulus B1; block4 - stimulus B2; 
block5 - stimulus C1; block6 - stimulus C2

I want to randomise the blocks in pairs , such that A1 is always followed 
by A2, B1 is always followedd by B2, C1 is always followed by C2. 
However,the presentation of these pairs should be randomized across 
subjects.
 Also, the presentation of blocks within each pair should be 
counterbalanced across subjects, such that half the sujects get A1 followed 
by A2 and other half get A2 followed by A1.

Can anyone help with this .

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