merge 2D array of 2D arrays into 2D array

I have a 2D array of 2D arrays t, which can be emulated by this code:

import numpy as np

n=3
x = np.random.randint(0,10, (n,1))
y = np.random.randint(0,10, (n,2))

t = np.empty((2,2), object)
t[0,:] = [x,y]
t[1,:] = [x+10,y+10]

How can I merge the t into a single array of size (6,3) like this:

np.vstack([np.hstack([x,y]), np.hstack([x,y])+10])

>Solution :

One sequence that works:

In [88]: [np.hstack(row) for row in t]
Out[88]: 
[array([[3, 9, 9],
        [1, 1, 0],
        [0, 6, 3]]),
 array([[13, 19, 19],
        [11, 11, 10],
        [10, 16, 13]])]

In [89]: np.concatenate([np.hstack(row) for row in t], axis=0)
Out[89]: 
array([[ 3,  9,  9],
       [ 1,  1,  0],
       [ 0,  6,  3],
       [13, 19, 19],
       [11, 11, 10],
       [10, 16, 13]])