What logic function is implemented with these logic gates, how to complete truth table
I don't know which element exactly has drawn on the picture, but my truth table looks like:

A | B | OUT(n-1) |    OUT(n)
--|---|----------|--------
0 | 0 |   0      |    1
0 | 0 |   1      |    1
0 | 1 |   0      |    0
0 | 1 |   1      |    X
1 | 0 |   0      |    0
1 | 0 |   1      |    X
1 | 1 |   0      |    1
1 | 1 |   1      |    1


But even this truth table I'm not sure that valid, because out doesn't keep it value and A and B can affect to OUT even when Vdd transistor (pMOS) is close .