How to collect arrays in an array?

Dear R-Experts,

Seek your help. 
Please let me know how arrays of different sizes can be collected in one
array.
suppose I want to collect following arrays in one array. How can I do so?

array(1): #row=3, #col=4(these columns store data of different types)
array(2): #row=6, #col=4
array(3): #row=3, #col=4
....

want to store in Main_array
How to define dimensions of Main_array?


Thank you.

Regards,
Suresh

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