笔供

笔供	bǐ gòng	written evidence, as opposed to oral evidence 口供
笔	bǐ	pen / pencil / writing brush / to write or compose / the strokes of Chinese characters / classifier for sums of money, deals / CL:支,枝
供	gōng	to provide; to supply / to be for (the use or convenience of)
供	gòng	to lay (sacrificial offerings) / (bound form) offerings / to confess (Taiwan pr. [gong1]) / confession; statement (Taiwan pr. [gong1])