"Any week during the whole or part of which the employee's relations with the employer are governed by a contract of employment which normally involves employment for sixteen hours or more weekly shall count in computing a period of employment."
"An employee who is absent from work wholly or partly because of pregnancy or confinement shall, subject to the following provisions of this Act, - (a). . . (b)be entitled to return to work."
"(3) An employee shall be entitled to the [right] referred to in subsection (1) whether or not a contract of employment subsists during the period of her absence but, subject to subsection (4), she shall not be so entitled unless - (a) . . . (b)she has at the beginning of that eleventh week been continuously employed for a period of not less than two years; . . ."
"If in any week the employee is, for the whole or part of the week - (d) absent from work wholly or partly because of pregnancy or confinement, that week shall, notwithstanding that it does not fall under paragraph 3, 4 or 5, count as a period of employment."
"Not more than twenty-six weeks shall, subject to paragraph 10, count under paragraph (d) of sub-paragraph (1) between any periods falling under paragraph 3, 4 or 5."