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pub(crate) const SYMBOL_ADD: &str = " + ";
pub(crate) const SYMBOL_MUL: &str = " * ";
pub(crate) const SYMBOL_POW: &str = "**";
pub(crate) const SYMBOL_DIV: &str = " / ";
pub(crate) const SYMBOL_SUB: &str = " - ";

pub(crate) const BRACKET_ROUND: (&str, &str) = ("(", ")");
pub(crate) const BRACKET_FIGURE: (&str, &str) = ("{", "}");
pub(crate) const BRACKET_SQUARE: (&str, &str) = ("[", "]");