Teacher:In this task, you will be given a passage to read. A fill in the blank question will be given to you.  Your answer should fit the blank appropriately.
Teacher: Now, understand the problem? Solve this instance:  The central shrine is a free @-@ standing square cell , with entrances on each of its sides . Each door is flanked by two dvarapalas ( gate keepers ) . The Linga , the symbol of Shiva in union with the Yoni , and the symbol of Parvati together symbolise the supreme unity that is deified by the shrine . The Linga is set on a raised platform above the floor of the shrine by 1 @.@ 8 m ( 5 ft 11 in ) . Six steps lead to this level from the floor level . The height of the eight dvarapalas varies from 4 @.@ 521 – 4 @.@ 623 m ( 14 @.@ 83 – 15 @.@ 17 ft ) . All are in a damaged condition except those at the southern door to the shrine . The southern gate statue has many unusual features – unusual headgear ; a large skull above the forehead ; lips parted with protruding teeth ; statues adorned with a single bead necklace , earrings , plain twisted armlets and thick wristlets ; a stooped right shoulder ; a globe held at navel level ; the robe is held at the right thigh by the left hand , and the legs are shapeless . fill in the blank  :   The central shrine is a free @-@ standing square __________________ , with entrances on each of its sides . 
Student:
 cell 