enum Operation {
	OP_I1,
	OP_I2,
	OP_I4,
	OP_I8,
	OP_U1,
	OP_U2,
	OP_U4,
	OP_U8,
	OP_STR,
	OP_MOVE,
	OP_INSERT,
	OP_DELETE,
	OP_SHOW
};