Template:If
{{safesubst:{{safesubst:#switch:||exist|expr={{safesubst:#if:|P3|P4}}|eq={{safesubst:#ifeq:||P4|P5}}|error={{safesubst:#if:{{safesubst:#iferror:||1}}|{{safesubst:#ifeq:|+|P4|P2}}|P3}}|If/errmsg}}|||||}}
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