### Instruction:

Extract the cause and effect entities from the following sentence:
Forging techniques should produce an internal grain-flow pattern parallel to the principal stresses, because mechanical properties are optimum in the direction of material flow during forging

### Assistant:

KEYWORD: because
CAUSE_1: mechanical properties are optimum in the direction of material flow during forging
VARIABLE: Forging techniques
CONDITION: should produce an internal grain-flow pattern parallel to the principal stresses
EFFECT_1: Forging techniques should produce an internal grain-flow pattern parallel to the principal stresses

