### Instruction:

Extract the cause and effect entities from the following sentence:
Rationale: Enriched oxygen concentrations increase the flammability of materials within that environment

### Assistant:

CAUSE_1: Enriched oxygen concentrations
CAUSE_2: that environment
KEYWORD: within
EFFECT_1: increase the flammability of materials
NOT_RELEVANT: Rationale
VARIABLE: that environment
CONDITION: increase

