What is the shape of -LRB- Cu -LRB- CN -RRB- -LSB- math -RSB- _ 4 -LSB- / math -RSB- -RRB- -LSB- math -RSB- ^ -LCB- 3 - -RCB- -LSB- / math -RSB- ?
What is the shape of -LSB- Cu -LRB- CN -RRB- 4 -RSB- 2 - ?