Ka jingkhein ia ka tnum dieng kaba lai dong .
Sngewbha pyni ia ki jingthew ha ki milimeter
X - Ka jingjrong jong ka truss
Y - Ka jingjrong jong u truss
Z - Ka jingkhluit jong u beam
W - Ka jingheh jong u beam
S - Ka jingdon jong ki post ba jrong
P - Ki jingteh
N - pyni ia ka jingbuh nombar ia ka bynta
Ka tnum dieng ka don ia ki element kiba pynlong ia ki jingtei kiba skhem kiba don sawdong.
Ka jingjrong ba la ai jingmut jong ka tnum dieng ka long ym duna ia ka 20 percent na ka jingjrong jong ka span.
Ka prokram kan khein ia ka jingdonkam jong ki tiar, kan pyni ia ki dur jong ka truss bad ki jingthew ba donkam jong ki bynta.