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blackboard channer candidate clay drub gray material slateth schedule slatestone splitter slater bluish shale rockman reslate bluestone double coverage knife argillite ash schistaceous slaty election colour punish ribbed snakestone slated slating rock grey slaten whiteboard layer artificial money lydian stone criticise killas harshly tabular cleave chalkboard unslated black chalk volcanic clean slate flake slateless zax scantle appendix:colors schist chalk rock butter slatest tab sedimentary thin anticipate strongly basalt expect slatily grapholite slates shindle metamorphose plate slatelike shiver board