commons-geometry-io-euclidean/src/main/java/org/apache/commons/geometry/io/euclidean/threed/txt/TextBoundaryWriteHandler3D.java [49:93]:
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    public String getVertexComponentSeparator() {
        return vertexComponentSeparator;
    }

    /** Set the string used to separate vertex components (ie, individual x, y, z values).
     * @param sep string used to separate vertex components
     * @see TextFacetDefinitionWriter#setVertexComponentSeparator(String)
     */
    public void setVertexComponentSeparator(final String sep) {
        this.vertexComponentSeparator = sep;
    }

    /** Get the string used to separate facet vertices.
     * @return string used to separate facet vertices
     * @see TextFacetDefinitionWriter#getVertexSeparator()
     */
    public String getVertexSeparator() {
        return vertexSeparator;
    }

    /** Set the string used to separate facet vertices.
     * @param sep string used to separate facet vertices
     * @see TextFacetDefinitionWriter#setVertexSeparator(String)
     */
    public void setVertexSeparator(final String sep) {
        this.vertexSeparator = sep;
    }

    /** Get the number of vertices required per facet or {@code -1} if no specific
     * number is required.
     * @return the number of vertices required per facet or {@code -1} if any geometricallly
     *      valid number is allowed (ie, any number greater than or equal to 3)
     * @see TextFacetDefinitionWriter#getFacetVertexCount()
     */
    public int getFacetVertexCount() {
        return facetVertexCount;
    }

    /** Set the number of vertices required per facet. This can be used to enforce a consistent
     * format in the output. Set to {@code -1} to allow any geometrically valid number of vertices
     * (ie, any number greater than or equal to 3).
     * @param vertexCount number of vertices required per facet or {@code -1} to allow any number
     * @see TextFacetDefinitionWriter#setFacetVertexCount(int)
     */
    public void setFacetVertexCount(final int vertexCount) {
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commons-geometry-io-euclidean/src/main/java/org/apache/commons/geometry/io/euclidean/threed/txt/TextFacetDefinitionWriter.java [116:157]:
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    public String getVertexComponentSeparator() {
        return vertexComponentSeparator;
    }

    /** Set the string used to separate vertex components (ie, individual x, y, z values).
     * @param sep string used to separate vertex components
     */
    public void setVertexComponentSeparator(final String sep) {
        this.vertexComponentSeparator = sep;
    }

    /** Get the string used to separate facet vertices. The default value is {@value #DEFAULT_VERTEX_SEPARATOR}.
     * @return string used to separate facet vertices
     */
    public String getVertexSeparator() {
        return vertexSeparator;
    }

    /** Set the string used to separate facet vertices.
     * @param sep string used to separate facet vertices
     */
    public void setVertexSeparator(final String sep) {
        this.vertexSeparator = sep;
    }

    /** Get the number of vertices required per facet or {@code -1} if no specific
     * number is required. The default value is {@value #DEFAULT_FACET_VERTEX_COUNT}.
     * @return the number of vertices required per facet or {@code -1} if any geometricallly
     *      valid number is allowed (ie, any number greater than or equal to 3)
     */
    public int getFacetVertexCount() {
        return facetVertexCount;
    }

    /** Set the number of vertices required per facet. This can be used to enforce a consistent
     * format in the output. Set to {@code -1} to allow any geometrically valid number of vertices
     * (ie, any number greater than or equal to 3).
     * @param vertexCount number of vertices required per facet or {@code -1} to allow any number
     * @throws IllegalArgumentException if the argument would produce invalid geometries (ie, is
     *      greater than -1 and less than 3)
     */
    public void setFacetVertexCount(final int vertexCount) {
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