For 38 cm block corners a 37 cm PASS block is to be positioned on the side of the 38 cm UNI block to take the interval to 25 cm (38 + 37 = 75 cm). On the side of the 50 cm UNI, having already positioned the 37 cm PASS on the 38 cm side, continue with 50 cm blocks. 37 cm PASS block packages have green straps.
For 25 cm block corners, it is not necessary to use PASS blocks because the interval is already 25 cm (25 + 50 = 75 cm).